patch 9.2.0405: when jumping to tags, will open URLs

Problem:  when jumping to tags, will open URLs
          (Srinivas Piskala Ganesh Babu)
Solution: Disallow trying to open remote files.

closes: #20068

Supported by AI

Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/tags

@@ -4778,6 +4778,7 @@ E1572	options.txt	/*E1572*
 E1573	channel.txt	/*E1573*
 E1574	channel.txt	/*E1574*
 E1575	builtin.txt	/*E1575*
+E1576	tagsrch.txt	/*E1576*
 E158	sign.txt	/*E158*
 E159	sign.txt	/*E159*
 E16	cmdline.txt	/*E16*

runtime/doc/tagsrch.txt

@@ -579,6 +579,9 @@ ctags).
 		have an absolute or relative path.  It may contain environment
 		variables and wildcards (although the use of wildcards is
 		doubtful).  It cannot contain a <Tab>.
+								*E1576*
+		Using a remote file via network protocol (e.g. using
+		http://remote/file.txt) is not allowed.
 {tagaddress}	The Ex command that positions the cursor on the tag.  It can
 		be any Ex command, although restrictions apply (see
 		|tag-security|).  Posix only allows line numbers and search