nits

Author: jerrytfleung

src/Instrumentation/PDO/README.md

@@ -36,7 +36,7 @@ OTEL_PHP_INSTRUMENTATION_PDO_DISTRIBUTE_STATEMENT_TO_LINKED_SPANS=true
 ```
 
 ### SQL Commenter feature
-The [sqlcommenter](https://google.github.io/sqlcommenter/) feature can be enabled using configuration directive, currently it can be used with `postgresql` and `mysql` drivers.:
+The [sqlcommenter](https://google.github.io/sqlcommenter/) feature can be enabled using configuration directive, currently it can be used with `postgresql` and `mysql` drivers only.
 ```
 otel.instrumentation.pdo.sql_commenter = true
 ```

src/Instrumentation/PDO/src/PDOInstrumentation.php

@@ -418,6 +418,6 @@ private static function addSqlComments(string $query): string
 
     private static function isSQLCommenterOptInDatabase(string $db) : bool
     {
-        return $db == "postgresql" || $db == "mysql";
+        return $db == 'postgresql' || $db == 'mysql';
     }
 }