doc: improve readability of dns.md

PR-URL: #43694
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>

doc/api/dns.md

@@ -140,7 +140,7 @@ The resolver instance will send its requests from the specified IP address.
 This allows programs to specify outbound interfaces when used on multi-homed
 systems.
 
-If a v4 or v6 address is not specified, it is set to the default, and the
+If a v4 or v6 address is not specified, it is set to the default and the
 operating system will choose a local address automatically.
 
 The resolver will use the v4 local address when making requests to IPv4 DNS
@@ -222,7 +222,7 @@ such as no available file descriptors.
 
 `dns.lookup()` does not necessarily have anything to do with the DNS protocol.
 The implementation uses an operating system facility that can associate names
-with addresses, and vice versa. This implementation can have subtle but
+with addresses and vice versa. This implementation can have subtle but
 important consequences on the behavior of any Node.js program. Please take some
 time to consult the [Implementation considerations section][] before using
 `dns.lookup()`.
@@ -268,7 +268,7 @@ The following flags can be passed as hints to [`dns.lookup()`][].
   returned if the current system has at least one IPv4 address configured.
 * `dns.V4MAPPED`: If the IPv6 family was specified, but no IPv6 addresses were
   found, then return IPv4 mapped IPv6 addresses. It is not supported
-  on some operating systems (e.g FreeBSD 10.1).
+  on some operating systems (e.g. FreeBSD 10.1).
 * `dns.ALL`: If `dns.V4MAPPED` is specified, return resolved IPv6 addresses as
   well as IPv4 mapped IPv6 addresses.
 
@@ -353,7 +353,7 @@ changes:
 
 * `hostname` {string} Host name to resolve.
 * `options` {Object}
-  * `ttl` {boolean} Retrieve the Time-To-Live value (TTL) of each record.
+  * `ttl` {boolean} Retrieves the Time-To-Live value (TTL) of each record.
     When `true`, the callback receives an array of
     `{ address: '1.2.3.4', ttl: 60 }` objects rather than an array of strings,
     with the TTL expressed in seconds.
@@ -387,7 +387,7 @@ changes:
   * `err` {Error}
   * `addresses` {string\[] | Object\[]}
 
-Uses the DNS protocol to resolve a IPv6 addresses (`AAAA` records) for the
+Uses the DNS protocol to resolve IPv6 addresses (`AAAA` records) for the
 `hostname`. The `addresses` argument passed to the `callback` function
 will contain an array of IPv6 addresses.
 
@@ -501,7 +501,7 @@ added: v0.9.12
   * `err` {Error}
   * `addresses` {Object\[]}
 
-Uses the DNS protocol to resolve regular expression based records (`NAPTR`
+Uses the DNS protocol to resolve regular expression-based records (`NAPTR`
 records) for the `hostname`. The `addresses` argument passed to the `callback`
 function will contain an array of objects with the following properties:
 
@@ -793,7 +793,7 @@ added: v15.3.0
 -->
 
 Cancel all outstanding DNS queries made by this resolver. The corresponding
-promises will be rejected with an error with code `ECANCELLED`.
+promises will be rejected with an error with the code `ECANCELLED`.
 
 ### `dnsPromises.getServers()`
 
@@ -857,7 +857,7 @@ such as no available file descriptors.
 
 [`dnsPromises.lookup()`][] does not necessarily have anything to do with the DNS
 protocol. The implementation uses an operating system facility that can
-associate names with addresses, and vice versa. This implementation can have
+associate names with addresses and vice versa. This implementation can have
 subtle but important consequences on the behavior of any Node.js program. Please
 take some time to consult the [Implementation considerations section][] before
 using `dnsPromises.lookup()`.
@@ -1072,7 +1072,7 @@ added: v10.6.0
 
 * `hostname` {string}
 
-Uses the DNS protocol to resolve regular expression based records (`NAPTR`
+Uses the DNS protocol to resolve regular expression-based records (`NAPTR`
 records) for the `hostname`. On success, the `Promise` is resolved with an array
 of objects with the following properties:
 
@@ -1268,11 +1268,11 @@ earlier ones time out or result in some other error.
 
 Each DNS query can return one of the following error codes:
 
-* `dns.NODATA`: DNS server returned answer with no data.
+* `dns.NODATA`: DNS server returned an answer with no data.
 * `dns.FORMERR`: DNS server claims query was misformatted.
 * `dns.SERVFAIL`: DNS server returned general failure.
 * `dns.NOTFOUND`: Domain name not found.
-* `dns.NOTIMP`: DNS server does not implement requested operation.
+* `dns.NOTIMP`: DNS server does not implement the requested operation.
 * `dns.REFUSED`: DNS server refused query.
 * `dns.BADQUERY`: Misformatted DNS query.
 * `dns.BADNAME`: Misformatted host name.
@@ -1293,7 +1293,7 @@ Each DNS query can return one of the following error codes:
 * `dns.ADDRGETNETWORKPARAMS`: Could not find `GetNetworkParams` function.
 * `dns.CANCELLED`: DNS query cancelled.
 
-The above error codes are also exported by the `dnsPromises` API, e.g., `dnsPromises.NODATA`.
+The `dnsPromises` API also exports the above error codes, e.g., `dnsPromises.NODATA`.
 
 ## Implementation considerations
 
@@ -1329,7 +1329,7 @@ allow the default resolver, `dns.lookup()`, to be replaced.
 
 These functions are implemented quite differently than [`dns.lookup()`][]. They
 do not use getaddrinfo(3) and they _always_ perform a DNS query on the
-network. This network communication is always done asynchronously, and does not
+network. This network communication is always done asynchronously and does not
 use libuv's threadpool.
 
 As a result, these functions cannot have the same negative impact on other