Change cfLoad to wfLoad in generated sample files (#287)

Should have been done a long time ago.

Also improve some of the explanatory comments around that code.

Dockerfile

@@ -661,16 +661,16 @@ RUN set -x; \
     cd $MW_HOME \
     && find . \( -name ".git" -o -name ".gitignore" -o -name ".gitmodules" -o -name ".gitattributes" \) -exec rm -rf -- {} +
 
-# Generate list of installed extensions
+# Generate sample files for installing extensions and skins in LocalSettings.php
 RUN set -x; \
 	cd $MW_HOME/extensions \
-    && for i in $(ls -d */); do echo "#cfLoadExtension('${i%%/}');"; done > $MW_ORIGIN_FILES/installedExtensions.txt \
-    # Dirty hack for SemanticMediawiki
-    && sed -i "s/#cfLoadExtension('SemanticMediaWiki');/#enableSemantics('localhost');/g" $MW_ORIGIN_FILES/installedExtensions.txt \
+    && for i in $(ls -d */); do echo "#wfLoadExtension('${i%%/}');"; done > $MW_ORIGIN_FILES/installedExtensions.txt \
+    # Dirty hack for Semantic MediaWiki
+    && sed -i "s/#wfLoadExtension('SemanticMediaWiki');/#enableSemantics('localhost');/g" $MW_ORIGIN_FILES/installedExtensions.txt \
     && cd $MW_HOME/skins \
-    && for i in $(ls -d */); do echo "#cfLoadSkin('${i%%/}');"; done > $MW_ORIGIN_FILES/installedSkins.txt \
-    #Loads Vector skin by default in the LocalSettings.php
-    && sed -i "s/#cfLoadSkin('Vector');/cfLoadSkin('Vector');/" $MW_ORIGIN_FILES/installedSkins.txt
+    && for i in $(ls -d */); do echo "#wfLoadSkin('${i%%/}');"; done > $MW_ORIGIN_FILES/installedSkins.txt \
+    # Load Vector skin by default in the sample file
+    && sed -i "s/#wfLoadSkin('Vector');/wfLoadSkin('Vector');/" $MW_ORIGIN_FILES/installedSkins.txt
 
 # Move files around
 RUN set -x; \