improve readability of string: fix indentation and remove trailing spaces

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
diff --git a/libc/string/strsep.c b/libc/string/strsep.c
index bcca681..c44bc5b 100644
--- a/libc/string/strsep.c
+++ b/libc/string/strsep.c
@@ -34,7 +34,7 @@
 
 /*
  * Get next token from string *stringp, where tokens are possibly-empty
- * strings separated by characters from delim.  
+ * strings separated by characters from delim.
  *
  * Writes NULs into the string at *stringp to end tokens.
  * delim need not remain constant from call to call.