patch 9.1.1178: not possible to generate completion candidates using fuzzy matching

Problem:  not possible to generate completion candidates using fuzzy
          matching
Solution: add the 'completefuzzycollect' option for (some) ins-completion
          modes (glepnir)

fixes #15296
fixes #15295
fixes #15294
closes: #16032

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 883a67f..6afe32f 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2025 Mar 03
+*options.txt*	For Vim version 9.1.  Last change: 2025 Mar 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2104,6 +2104,18 @@
 	This option cannot be set from a |modeline| or in the |sandbox|, for
 	security reasons.
 
+						*'completefuzzycollect'* *'cfc'*
+'completefuzzycollect' 'cfc'	string	(default: empty)
+				global
+	This option enables fuzzy collection for (only some) specific
+	|ins-completion| modes, adjusting how items are gathered for fuzzy
+	matching based on input.
+	The option can contain the following values (separated by commas),
+	each enabling fuzzy collection for a specific completion mode:
+	files		file names
+	keyword		keyword completion in 'complete' and current file
+	whole_line	whole lines
+
 						*'completeitemalign'* *'cia'*
 'completeitemalign' 'cia' string (default: "abbr,kind,menu")
 			  global
@@ -2123,7 +2135,12 @@
 	   fuzzy    Enable |fuzzy-matching| for completion candidates. This
 		    allows for more flexible and intuitive matching, where
 		    characters can be skipped and matches can be found even
-		    if the exact sequence is not typed.
+		    if the exact sequence is not typed. Note: This option
+		    does not affect the collection of candidate list, it only
+		    controls how completion candidates are reduced from the
+		    list of alternatives. If you want to use |fuzzy-matching|
+		    to gather more alternatives for your candidate list,
+		    see |'completefuzzycollect'|.
 
 	   longest  Only insert the longest common text of the matches.  If
 		    the menu is displayed you can use CTRL-L to add more