docs: explain it's about class name casing

Author: geerteltink

CHANGELOG.md

@@ -66,7 +66,7 @@ All notable changes to this project will be documented in this file, in reverse
   - There MUST NOT be duplicate class names.
   - The file name MUST match the case of the terminating class name.
   - PHP 4 style constructors MUST NOT be used.
-  - The correct class names MUST be used.
+  - Correct class name casing MUST be used.
   - Abstract classes MUST have a `Abstract` prefix.
   - Exception classes MUST have a `Exception` suffix.
   - Interface classes MUST have a `Interface` suffix.

docs/book/v2/coding-style-guide.md

@@ -417,7 +417,7 @@ new Foo();
 >
 > PHP 4 style constructors MUST NOT be used.
 >
-> The correct class names MUST be used.
+> Correct class name casing MUST be used.
 >
 > Abstract classes MUST have a `Abstract` prefix.
 >

src/ZendCodingStandard/ruleset.xml

@@ -306,7 +306,7 @@
     <rule ref="WebimpressCodingStandard.NamingConventions.Interface"/>
     <!-- Trait classes MUST have a `Trait` suffix. -->
     <rule ref="WebimpressCodingStandard.NamingConventions.Trait"/>
-    <!-- The correct class names MUST be used. -->
+    <!-- Correct class name casing MUST be used. -->
     <rule ref="WebimpressCodingStandard.PHP.CorrectClassNameCase"/>
     <!-- For self-reference a class lower-case `self::` MUST be used without
          spaces around the scope resolution operator. -->