runtime(doc): update doc for :horizontal

Revert the documentation for :horizontal from commit
0c3e57b403e0e3a1fefc because :horizontal cannot be shortened to :ho

closes: #16362

Signed-off-by: h-east <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/windows.txt b/runtime/doc/windows.txt
index 8120628..db24e51 100644
--- a/runtime/doc/windows.txt
+++ b/runtime/doc/windows.txt
@@ -263,8 +263,8 @@
 		will be equalized only vertically.
 		Doesn't work for |:execute| and |:normal|.
 
-						*:ho* *:horizontal*
-:ho[rizontal] {cmd}
+						*:hor* *:horizontal*
+:hor[izontal] {cmd}
 		Execute {cmd}.  Currently only makes a difference for
 		`horizontal wincmd =`, which will equalize windows only
 		horizontally.