patch 8.2.0945: cannot use "z=" when 'spell' is off

Problem:    Cannot use "z=" when 'spell' is off.
Solution:   Make "z=" work even when 'spell' is off. (Christian Brabandt,
            Gary Johnson, closes #6227)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index f3e240a..78588bf 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -9537,9 +9537,8 @@
 			echo spellbadword("the quik brown fox")
 <			['quik', 'bad'] ~
 
-		The spelling information for the current window is used.  The
-		'spell' option must be set and the value of 'spelllang' is
-		used.
+		The spelling information for the current window and the value
+		of 'spelllang' are used.
 
 		Can also be used as a |method|: >
 			GetText()->spellbadword()
@@ -9564,8 +9563,7 @@
 		although it may appear capitalized.
 
 		The spelling information for the current window is used.  The
-		'spell' option must be set and the values of 'spelllang' and
-		'spellsuggest' are used.
+		values of 'spelllang' and 'spellsuggest' are used.
 
 		Can also be used as a |method|: >
 			GetWord()->spellsuggest()