Fix $tableInformation documentation in pgsql and mysql schema.php

replaced the DatabaseConnection_pgsql->queryTableInformation with \Drupal\Core\Database\Driver\pgsql\Schema::queryTableInformation(). Adding patch for it.

Looks good to me.

Thanks for working on this!

There's another outdated reference in this pattern in Schema.php:

[drupal | Sun 13:55:11] $ grep -r "DatabaseConnection\_" *
core/lib/Drupal/Core/Database/Driver/mysql/Schema.php:    // @see DatabaseConnection_mysql
core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php:   * This is collected by DatabaseConnection_pgsql->queryTableInformation(),
core/modules/migrate_drupal/tests/fixtures/drupal7.php:  'name' => 'DatabaseConnection_mysql',
core/modules/migrate_drupal/tests/fixtures/drupal7.php:  'name' => 'DatabaseConnection_pgsql',
core/modules/migrate_drupal/tests/fixtures/drupal7.php:  'name' => 'DatabaseConnection_sqlite',

(The last three references are in a Drupal 7 fixture and so do not need to be changed.)

+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
@@ -20,8 +20,9 @@ class Schema extends DatabaseSchema {
-   * This is collected by DatabaseConnection_pgsql->queryTableInformation(),
-   * by introspecting the database.
+   * This is collected by
+   * \Drupal\Core\Database\Driver\pgsql\Schema::queryTableInformation(), by
+   * introspecting the database.
    *
    * @see \Drupal\Core\Database\Driver\pgsql\Schema::queryTableInformation()

Since we've got the @see we don't to use the fully qualified class name because it is redundant. So changing this to Schema::queryTableInformation().

adding updated patch as suggested.

I think that this is how @xjm and @alexpott would like to have it.

Since this is docs it can go in both 8.3.x and 8.2.x.

Committed and pushed 178cbb9 to 8.3.x and a51cf37 to 8.2.x. Thanks!