patch 8.2.5029: "textlock" is always zero

Problem:    "textlock" is always zero.
Solution:   Remove "textlock" and rename "textwinlock" to "textlock".
            (closes #10489)
diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index d8bddce..8c35798 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -671,7 +671,7 @@
 ends CTRL-X mode (any key that is not a valid CTRL-X mode command) is mapped.
 Also, when doing completion with 'complete' mappings apply as usual.
 
-							*E578* *E565*
+								*E565*
 Note: While completion is active Insert mode can't be used recursively and
 buffer text cannot be changed.  Mappings that somehow invoke ":normal i.."
 will generate an E565 error.