Fix typos in misc files (#77)

* fix typos in misc files

* Make class plural manually

Since the plural of `class` is `classes` we need to manually intervene.

Author: pkevan

docs/bin/generate-parsed-md.php

@@ -540,7 +540,12 @@ function ( $count ) {
 			ksort( $types );
 
 			foreach ( $types as $type => $elements ) {
-				$markdown .= '### ' . ucfirst( $type ) . "s\n\n";
+				// Make `class` plural manually.
+				if ( 'class' === strtolower( $type ) ) {
+					$markdown .= '### ' . ucfirst( 'classes' ) . "\n\n";
+				} else {
+					$markdown .= '### ' . ucfirst( $type ) . "s\n\n";
+				}
 
 				// Sort elements alphabetically
 				sort( $elements );

docs/code-reference/META.md

@@ -573,7 +573,7 @@ This file tracks code elements that need documentation.
 
 ## rest-api/class-acf-rest-api.php
 
-### Classs
+### Classes
 
 - `ACF_Rest_Api`