updated for version 7.4.237
Problem:    When some patches was not included has("patch-7.4.123") may return
            true falsely.
Solution:   Check for the specific patch number.
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 66b3038..007c7f7 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1682,7 +1682,7 @@
 		is 501.  Read-only.  "version" also works, for backwards
 		compatibility.
 		Use |has()| to check if a certain patch was included, e.g.: >
-			if has("patch123")
+			if has("patch-7.4.123")
 <		Note that patch numbers are specific to the version, thus both
 		version 5.0 and 5.1 may have a patch 123, but these are
 		completely different.