Minor copy editing improvements

Co-authored-by: lena-larionova <54370747+lena-larionova@users.noreply.github.com>

app/gateway/changelog.md

@@ -364,7 +364,7 @@ Debian 8 [reached end-of-life in June 30, 2020](https://www.debian.org/News/2020
 * Tags may now contain space characters.
   [#9143](https://github.com/Kong/kong/pull/9143)
 * Support for the `nginx-opentracing` module is deprecated as of `3.0` and will
-  be removed from Kong in `4.0` (see the `Known Limitations` section for additional
+  be removed from Kong in `4.0` (see the [Known Limitations](#known-limitations) section for additional
   information).
 
 #### Admin API
@@ -766,7 +766,7 @@ openid-connect
     * Upgrades from versions before 2.1.0.0 are not supported with 3.0.0.0.
 
 * OpenTracing: There is an issue with `nginx-opentracing` in this release, so it is not
-  recommended to upgrade quite yet if you are an OpenTracing user. This will be
+  recommended to upgrade yet if you are an OpenTracing user. This will be
   rectified in an upcoming patch/minor release.
 
 ### Dependencies