vim-patch:4edaf89: runtime(doc): improve preinserted() doc

Change the second "if" to "because", otherwise it may be misinterpreted
that preinserted() can return non-zero just because these options are
set.

closes: vim/vim#18409

4edaf89233

runtime/doc/vimfn.txt

@@ -7234,9 +7234,9 @@ pow({x}, {y})                                                            *pow()*
 
 preinserted()                                                    *preinserted()*
 		Returns non-zero if text has been inserted after the cursor
-		because "preinsert" is present in 'completeopt', or if
+		because "preinsert" is present in 'completeopt', or because
 		"longest" is present in 'completeopt' while 'autocomplete'
-		is enabled.  Otherwise returns zero.
+		is active.  Otherwise returns zero.
 
                 Return: ~
                   (`number`)

runtime/lua/vim/_meta/vimfn.lua

@@ -6555,9 +6555,9 @@ function vim.fn.perleval(expr) end
 function vim.fn.pow(x, y) end
 
 --- Returns non-zero if text has been inserted after the cursor
---- because "preinsert" is present in 'completeopt', or if
+--- because "preinsert" is present in 'completeopt', or because
 --- "longest" is present in 'completeopt' while 'autocomplete'
---- is enabled.  Otherwise returns zero.
+--- is active.  Otherwise returns zero.
 ---
 --- @return number
 function vim.fn.preinserted() end

src/nvim/eval.lua

@@ -8027,9 +8027,9 @@ M.funcs = {
   preinserted = {
     desc = [=[
       Returns non-zero if text has been inserted after the cursor
-      because "preinsert" is present in 'completeopt', or if
+      because "preinsert" is present in 'completeopt', or because
       "longest" is present in 'completeopt' while 'autocomplete'
-      is enabled.  Otherwise returns zero.
+      is active.  Otherwise returns zero.
     ]=],
     name = 'preinserted',
     params = {},