Replace all Desc keys with DescEx, plus some fixes

All Desc keys were converted to DescEx keys with correctly formatted
REML.
Fixes were:
* Mispelled "Commants" key renamed as "Extra" and REML formatted.
* Duplicated "Extra" keys were merged into one.
Also added a link to an RFC to one DescEx value.

Author: delphidabbler

csdb/collection/arrays.ini

@@ -117,7 +117,7 @@ Delphi10S=Y
 FPC=Y
 
 [StringListToArray]
-Desc="Creates and returns a dynamic string array containing all the strings from the given string list."
+DescEx="<p>Creates and returns a dynamic string array containing all the strings from the given string list.</p>"
 SeeAlso=ArrayToStringList
 Units=Classes,Types
 Snip=347.dat
@@ -186,7 +186,7 @@ Delphi10S=Y
 FPC=Y
 
 [CloneByteArray]
-Desc="Makes a copy of an array of bytes."
+DescEx="<p>Makes a copy of an array of bytes.</p>"
 Extra="<p>Useful for creating a <var>TBytes</var> array from a constant array or for cloning an existing byte array.</p>"
 Depends=TBytes
 SeeAlso=AppendByteArray
@@ -349,7 +349,7 @@ FPC=Y
 
 [TArrayUtils]
 Kind=class
-Desc="A method-only advanced record that provides utility methods for working with generic dynamic arrays."
+DescEx="<p>A method-only advanced record that provides utility methods for working with generic dynamic arrays.</p>"
 Units=Generics.Defaults
 SeeAlso=IndexOfByte,ByteArraysEqual,ByteArraysSameStart
 TestInfo=advanced