doc: multiple updates to child_process.md

* use serial comma in child_process.md
* use American spelling of unsanitized in child_process.md
* hyphenate general-purpose in child_process.md
* remove errant commas in child_process.md

PR-URL: #17990
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Trott

doc/api/child_process.md

@@ -25,7 +25,7 @@ ls.on('close', (code) => {
 });
 ```
 
-By default, pipes for `stdin`, `stdout` and `stderr` are established between
+By default, pipes for `stdin`, `stdout`, and `stderr` are established between
 the parent Node.js process and the spawned child. It is possible to stream data
 through these pipes in a non-blocking way. *Note, however, that some programs
 use line-buffered I/O internally. While that does not affect Node.js, it can
@@ -170,7 +170,7 @@ exec('echo "The \\$HOME variable is $HOME"');
 //The $HOME variable is escaped in the first instance, but not in the second
 ```
 
-*Note*: Never pass unsanitised user input to this function. Any input
+*Note*: Never pass unsanitized user input to this function. Any input
 containing shell metacharacters may be used to trigger arbitrary command
 execution.
 
@@ -418,7 +418,7 @@ The `child_process.spawn()` method spawns a new process using the given
 `command`, with command line arguments in `args`. If omitted, `args` defaults
 to an empty array.
 
-*Note*: If the `shell` option is enabled, do not pass unsanitised user input to
+*Note*: If the `shell` option is enabled, do not pass unsanitized user input to
 this function. Any input containing shell metacharacters may be used to
 trigger arbitrary command execution.
 
@@ -661,7 +661,7 @@ The [`child_process.spawnSync()`][], [`child_process.execSync()`][], and
 the Node.js event loop, pausing execution of any additional code until the
 spawned process exits.
 
-Blocking calls like these are mostly useful for simplifying general purpose
+Blocking calls like these are mostly useful for simplifying general-purpose
 scripting tasks and for simplifying the loading/processing of application
 configuration at startup.
 
@@ -715,7 +715,7 @@ completely exited.
 does not exit, the parent process will still wait until the child process has
 exited.
 
-If the process times out, or has a non-zero exit code, this method ***will***
+If the process times out or has a non-zero exit code, this method ***will***
 throw an [`Error`][] that will include the full result of the underlying
 [`child_process.spawnSync()`][].
 
@@ -767,11 +767,11 @@ exited. *Note that if  the child process intercepts and handles the `SIGTERM`
 signal and doesn't exit, the parent process will wait until the child
 process has exited.*
 
-If the process times out, or has a non-zero exit code, this method ***will***
+If the process times out or has a non-zero exit code, this method ***will***
 throw.  The [`Error`][] object will contain the entire result from
 [`child_process.spawnSync()`][]
 
-*Note*: Never pass unsanitised user input to this function. Any input
+*Note*: Never pass unsanitized user input to this function. Any input
 containing shell metacharacters may be used to trigger arbitrary command
 execution.
 
@@ -839,7 +839,7 @@ completely exited. Note that if the process intercepts and handles the
 `SIGTERM` signal and doesn't exit, the parent process will wait until the child
 process has exited.
 
-*Note*: If the `shell` option is enabled, do not pass unsanitised user input
+*Note*: If the `shell` option is enabled, do not pass unsanitized user input
 to this function. Any input containing shell metacharacters may be used to
 trigger arbitrary command execution.