Pacify more docstring control char warnings

* lisp/org/org-macs.el (org-split-string): Escape control chars.
* lisp/org/ox-latex.el (org-latex-guess-babel-language): And here.

lisp/org/org-macs.el

@@ -982,7 +982,7 @@ Otherwise, return nil."
   "Splits STRING into substrings at SEPARATORS.
 
 SEPARATORS is a regular expression.  When nil, it defaults to
-\"[ \f\t\n\r\v]+\".
+\"[ \\f\\t\\n\\r\\v]+\".
 
 Unlike `split-string', matching SEPARATORS at the beginning and
 end of string are ignored."

lisp/org/ox-latex.el

@@ -1632,7 +1632,7 @@ explicitly been loaded.  Then it is added to the rest of
 package's options.
 
 The optional argument to Babel or the mandatory argument to
-`\babelprovide' command may be \"AUTO\" which is then replaced
+`\\babelprovide' command may be \"AUTO\" which is then replaced
 with the language of the document or
 `org-export-default-language' unless language in question is
 already loaded.