Fix typos in comments.

lib-src/make-docfile.c

@@ -240,10 +240,10 @@ struct rcsoc_state
   /* A keyword we look for at the beginning of lines.  If found, it is
      not copied, and SAW_KEYWORD is set to true.  */
   char *keyword;
-  /* The current point we've reached in an occurance of KEYWORD in
+  /* The current point we've reached in an occurrence of KEYWORD in
      the input stream.  */
   char *cur_keyword_ptr;
-  /* Set to true if we saw an occurance of KEYWORD.  */
+  /* Set to true if we saw an occurrence of KEYWORD.  */
   int saw_keyword;
 };
 
@@ -354,7 +354,7 @@ scan_keyword_or_put_char (ch, state)
    PRINTFLAG is positive, output string contents to outfile.  If it is
    negative, store contents in buf.  Convert escape sequences \n and
    \t to newline and tab; discard \ followed by newline.
-   If SAW_USAGE is non-zero, then any occurances of the string `usage:'
+   If SAW_USAGE is non-zero, then any occurrences of the string `usage:'
    at the beginning of a line will be removed, and *SAW_USAGE set to
    true if any were encountered.  */
 

lisp/cedet/cedet-files.el

@@ -69,7 +69,7 @@ specific conversions during tests."
   (let ((file referencefile))
     ;; Replace the ! with /
     (setq file (subst-char-in-string ?! ?/ file))
-    ;; Occurances of // meant there was once a single !.
+    ;; Occurrences of // meant there was once a single !.
     (setq file (replace-regexp-in-string "//" "!" file))
 
     ;; Handle Windows special cases

lisp/cedet/srecode/extract.el

@@ -216,7 +216,7 @@ Return nil if nothing was extracted."
   (srecode-insert-include-lookup ins dict)
   ;; There are two modes for includes.  One is with no dict,
   ;; so it is inserted straight.  If the dict has a name, then
-  ;; we need to run once per dictionary occurance.
+  ;; we need to run once per dictionary occurrence.
   (if (not (string= (oref ins :object-name) ""))
       ;; With a name, do the insertion.
       (let ((subdict (srecode-dictionary-add-section-dictionary

lisp/textmodes/artist.el

@@ -5528,7 +5528,7 @@ The event, EV, is the mouse event."
 ;;         See `artist-draw-rect' for an example.
 ;;
 ;;         You must call the init-fn, the prep-fill-fn, arrow-set-fn
-;;         and the exit-fn at the apropriate points.
+;;         and the exit-fn at the appropriate points.
 ;;
 ;;         When artist-mouse-draw-xxx ends, the shape for your mode
 ;;         must be completely drawn.
@@ -5561,7 +5561,7 @@ The event, EV, is the mouse event."
 ;;         work.
 ;;
 ;;         You must call the init-fn, the prep-fill-fn, arrow-set-fn
-;;         and the exit-fn at the apropriate points.
+;;         and the exit-fn at the appropriate points.
 ;;
 ;;      e. Add your new mode to the master table, `artist-mt'.
 ;;