Remove duplicated entities from doc-base global.ent (#4282)

Co-authored-by: André L F S Bacci <[email protected]>

Author: alfsb

language-snippets.ent

@@ -796,14 +796,8 @@ files from the PHP folder into the Windows system directory also works
 <!ENTITY style.oop 'Object-oriented style'>
 <!ENTITY style.procedural 'Procedural style'>
 
-<!ENTITY resource '<link xmlns="http://docbook.org/ns/docbook" linkend="language.types.resource">resource</link>'>
-
-<!ENTITY foreach '<link xmlns="http://docbook.org/ns/docbook" linkend="control-structures.foreach">foreach</link>'>
-
 <!ENTITY match '<link xmlns="http://docbook.org/ns/docbook" linkend="control-structures.match">match</link>'>
 
-<!ENTITY yield '<link xmlns="http://docbook.org/ns/docbook" linkend="control-structures.yield">yield</link>'>
-
 <!ENTITY parameter.context 'Refer to the <link xmlns="http://docbook.org/ns/docbook" linkend="context">context</link>
 section of the manual for a description of <literal xmlns="http://docbook.org/ns/docbook">contexts</literal>.'>