Docs: Add a missing word in maybe_create_table() description.

Follow-up to [31246].

Props crstauf, james0r.
Fixes #58841.

git-svn-id: https://develop.svn.wordpress.org/trunk@56270 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/upgrade.php

@@ -2485,7 +2485,7 @@ function upgrade_network() {
 /**
  * Creates a table in the database, if it doesn't already exist.
  *
- * This method checks for an existing database and creates a new one if it's not
+ * This method checks for an existing database table and creates a new one if it's not
  * already present. It doesn't rely on MySQL's "IF NOT EXISTS" statement, but chooses
  * to query all tables first and then run the SQL statement creating the table.
  *