Update LIT records related to Tarika Walda Amid

I replaced the link to the Tarika Walda ʾAmid (LIT4723TarikaWaldaAmid) by a pointer to the Beta-recension (LIT6936TarWaAmidBeta). However, I am not perfectly content with that structure, because I think, that the different layers can be described better in another way.

4001-5000/LIT4724WaldaAmidIntroduction.xml

@@ -4,7 +4,7 @@ type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?><TEI
     <teiHeader xml:base="https://betamasaheft.eu/">
         <fileDesc>
             <titleStmt>
-                <title xml:lang="en" xml:id="t1">Abbreviated Introduction of Walda ʿAmid</title>
+                <title xml:lang="en" xml:id="t1">Abbreviated Introduction of Walda ʾAmid</title>
                 <editor role="generalEditor" key="AB"/>
                 <editor key="DR"/>
                 <funder>Akademie der Wissenschaften in Hamburg</funder>
@@ -36,7 +36,7 @@ type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?><TEI
         <profileDesc>
             <creation/>
             <abstract>
-                <p>This work is composed of abbreviated excerpts from the introduction of <ref type="work" corresp="LIT4723TarikaWaldaAmid"/> and included as an introduction in many historiographic works, among them the
+                <p>This work is composed of abbreviated excerpts from the introduction of <ref type="work" corresp="LIT6936TarWaAmidBeta"/> and included as an introduction in many historiographic works, among them the
                     <ref type="work" corresp="LIT4090Haylu"/>. It is different from <ref type="work" corresp="LIT4089Introduction"/>, another abbreviated introduction of <ref type="work" corresp="LIT4723TarikaWaldaAmid"/>, which  
                     forms the introduction of a type of the <ref type="work" corresp="LIT2352ShortC"/>.
                 </p>

4001-5000/LIT4839IntroductionWaldaAmid.xml

@@ -46,7 +46,7 @@ type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?><TEI
                 </keywords>
             </textClass>
             <abstract>
-            <p>Excerpt from <ref type="work" corresp="LIT4723TarikaWaldaAmid"/> as contained in <ref type="mss" corresp="FSUor40"/>. This excerpt is lengthier
+                <p>Excerpt from <ref type="work" corresp="LIT6936TarWaAmidBeta"/> as contained in <ref type="mss" corresp="FSUor40"/>. This excerpt is lengthier
                 than <ref type="work" corresp="LIT4724WaldaAmidIntroduction"/> and <ref type="work" corresp="LIT4089Introduction"/> and includes the beginning of the work.</p>
          </abstract>
             <langUsage><language ident="en">English</language></langUsage>