patch 8.1.1270: cannot see current match position

Problem:    Cannot see current match position.
Solution:   Show "3/44" when using the "n" command and "S" is not in
            'shortmess'. (Christian Brabandt, closes #4317)

runtime/doc/pattern.txt

@@ -152,6 +152,17 @@ use <Esc> to abandon the search.
 All matches for the last used search pattern will be highlighted if you set
 the 'hlsearch' option.  This can be suspended with the |:nohlsearch| command.
 
+When 'shortmess' does not include the "S" flag, Vim will automatically show an
+index, on which the cursor is. This can look like this: >
+
+  [1/5]		Cursor is on first of 5 matches.
+  [1/>99]	Cursor is on first of more than 99 matches.
+  [>99/>99]	Cursor is after 99 match of more than 99 matches.
+  [?/??]	Unknown how many matches exists, generating the
+		statistics was aborted because of search timeout.
+
+Note: the count does not take offset into account.
+
 When no match is found you get the error: *E486* Pattern not found
 Note that for the |:global| command this behaves like a normal message, for Vi
 compatibility.  For the |:s| command the "e" flag can be used to avoid the
@@ -299,6 +310,14 @@ when executing a pattern takes a long time and when checking for messages on
 channels a callback is invoked that also uses a pattern or an autocommand is
 triggered.  In most cases this should be fine, but if a pattern is in use when
 it's used again it fails.  Usually this means there is something wrong with
+the pattern.
+
+								*E956*
+In very rare cases a regular expression is used recursively.  This can happen
+when executing a pattern takes a long time and when checking for messages on
+channels a callback is invoked that also uses a pattern or an autocommand is
+triggered.  In most cases this should be fine, but if a pattern is in use when
+it's used again it fails.  Usually this means there is something wrong with
 the pattern.
 
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