Apply changes suggested during PR review

- Fix the title to match the sniff name.
- Be specific about the @ operator in the standard description.
- Mention the exception for certain functions without listing them.
- Simplify the code examples to focus on the presence/absence of @.
- Rename the variable from $conn_id to $connection as
`ftp_connect()` does not return a connection ID.

Author: rodrigoprimo

WordPress/Docs/PHP/NoSilencedErrorsStandard.xml

@@ -1,35 +1,22 @@
 <?xml version="1.0"?>
 <documentation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="https://phpcsstandards.github.io/PHPCSDevTools/phpcsdocs.xsd"
-    title="Discourage the use of the PHP error silencing operator"
+    title="No Silenced Errors"
     >
     <standard>
     <![CDATA[
-    Silencing errors is strongly discouraged. Use proper error checking instead.
-
-    Using the error operator with certain functions is allowed because no amount of error checking can fully prevent PHP from throwing errors when these functions are executed. The functions where this is permitted include, but are not limited to:
-
-    - `file_exists()`
-    - `file_get_contents()`
-    - `filesize()`
-    - `filetype()`
-    - `fopen()`
-    - `ftp_login()`
-    - `ftp_rename()`
+    The error silencing operator (@) should not be used. As an exception, the operator is allowed for certain functions where errors cannot be prevented through error checking.
     ]]>
     </standard>
     <code_comparison>
-        <code title="Valid: Using proper error checking when calling functions not in the allowed list.">
+        <code title="Valid: Calling a function without error silencing.">
         <![CDATA[
-$conn_id = ftp_connect( $ftp_server );
-if ( ! $conn_id ) {
-  // Handle it as needed.
-}
+$connection = <em></em>ftp_connect( $ftp_server );
         ]]>
         </code>
-        <code title="Invalid: Using the error operator to silence errors.">
+        <code title="Invalid: Using the @ operator to silence errors.">
         <![CDATA[
-$conn_id = <em>@ftp_connect( $ftp_server );</em>
+$connection = <em>@</em>ftp_connect( $ftp_server );
         ]]>
         </code>
     </code_comparison>