runtime(doc): CI fails with trailing whitespace error in usr_30.txt

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/usr_30.txt b/runtime/doc/usr_30.txt
index 9efc2ef..86fe649 100644
--- a/runtime/doc/usr_30.txt
+++ b/runtime/doc/usr_30.txt
@@ -450,7 +450,7 @@
 a result impossible to get with the <Tab> key and 'tabstop' set to 8.
  To optimize space, `vi` would also silently remove packs of spaces and replace
 them with tab characters.  The following shows what happens pressing <C-t>
-a few times. 
+a few times.
   A "." stands for a space character and "------->" for a tab character.
 
 	type				result ~
@@ -466,7 +466,7 @@
 	<C-t><Tab><C-t><C-d>		------->
 
   A third option that one could set in `vi` was 'autoindent'.  It copies the
-indent level of the previous lines, 
+indent level of the previous lines,
 
 	type				result ~
 	<Space><Tab>hello		.------>hello