Doc fix.

lisp/emacs-lisp/byte-opt.el

@@ -1235,7 +1235,7 @@
 (defun disassemble-offset ()
   "Don't call this!"
   ;; fetch and return the offset for the current opcode.
-  ;; return NIL if this opcode has no offset
+  ;; return nil if this opcode has no offset
   ;; OP, PTR and BYTES are used and set dynamically
   (defvar op)
   (defvar ptr)

lisp/emacs-lisp/cl-macs.el

@@ -2376,7 +2376,7 @@ Otherwise, return result of last FORM."
 	  v)
       (if (eq x (car v)) (cdr v) '(t)))))
 
-;;; Count number of times X refers to Y.  Return NIL for 0 times.
+;;; Count number of times X refers to Y.  Return nil for 0 times.
 (defun cl-expr-contains (x y)
   (cond ((equal y x) 1)
 	((and (consp x) (not (memq (car-safe x) '(quote function function*))))

lisp/emacs-lisp/elint.el

@@ -214,7 +214,7 @@ Returns the forms."
 
 (defun elint-find-next-top-form ()
   "Find the next top form from point.
-Returns nil if there are no more forms, T otherwise."
+Return nil if there are no more forms, t otherwise."
   (parse-partial-sexp (point) (point-max) nil t)
   (not (eobp)))
 

lisp/emacs-lisp/elp.el

@@ -177,7 +177,7 @@ functions will be displayed."
   :group 'elp)
 
 (defcustom elp-recycle-buffers-p t
-  "*Nil says to not recycle the `elp-results-buffer'.
+  "*nil says to not recycle the `elp-results-buffer'.
 In other words, a new unique buffer is create every time you run
 \\[elp-results]."
   :type 'boolean

lisp/emacs-lisp/ewoc.el

@@ -375,7 +375,7 @@ Returns nil if NODE is nil or the first element."
 
 (defun ewoc-nth (ewoc n)
   "Return the Nth node.
-N counts from zero. Nil is returned if there is less than N elements.
+N counts from zero.  Return nil if there is less than N elements.
 If N is negative, return the -(N+1)th last element.
 Thus, (ewoc-nth dll 0) returns the first node,
 and (ewoc-nth dll -1) returns the last node.