Ensure ' in docstring code snippets is not replaced

As of Emacs 25.1, `foo' is displayed as ‘foo’. This is controlled by
text-quoting-style, but curved quotes are the default.

This causes problems for docstrings that contain ' in code
snippets. Help buffers show e.g. (funcall 'foo) as (funcall ’foo),
which isn't legal elisp.

Instead, escape the quotes with \=. See substitute-command-keys for
the full docs on \= escaping.

dash-functional.el

@@ -207,10 +207,10 @@ In types (for n=2): ((a -> b), (c -> d)) -> (a, c) -> (b, d)
 
 This function satisfies the following laws:
 
-  (-compose (-prodfn f g ...) (-prodfn f' g' ...)) = (-prodfn (-compose f f') (-compose g g') ...)
-  (-prodfn f g ...) = (-juxt (-compose f (-partial 'nth 0)) (-compose g (-partial 'nth 1)) ...)
-  (-compose (-prodfn f g ...) (-juxt f' g' ...)) = (-juxt (-compose f f') (-compose g g') ...)
-  (-compose (-partial 'nth n) (-prod f1 f2 ...)) = (-compose fn (-partial 'nth n))"
+  (-compose (-prodfn f g ...) (-prodfn f\\=' g\\=' ...)) = (-prodfn (-compose f f\\=') (-compose g g\\=') ...)
+  (-prodfn f g ...) = (-juxt (-compose f (-partial \\='nth 0)) (-compose g (-partial \\='nth 1)) ...)
+  (-compose (-prodfn f g ...) (-juxt f\\=' g\\=' ...)) = (-juxt (-compose f f\\=') (-compose g g\\=') ...)
+  (-compose (-partial \\='nth n) (-prod f1 f2 ...)) = (-compose fn (-partial \\='nth n))"
   (lambda (x) (-zip-with 'funcall fns x)))
 
 (provide 'dash-functional)

dash.el

@@ -1324,7 +1324,7 @@ combinations created by taking one element from each list in
 order.  The results are flattened, ignoring the tensor structure
 of the result.  This is equivalent to calling:
 
-  (-flatten-n (1- (length lists)) (apply '-table fn lists))
+  (-flatten-n (1- (length lists)) (apply \\='-table fn lists))
 
 but the implementation here is much more efficient.
 
@@ -2046,7 +2046,7 @@ execute body."
   "Tests for equality use this function or `equal' if this is nil.
 It should only be set using dynamic scope with a let, like:
 
-  (let ((-compare-fn #'=)) (-union numbers1 numbers2 numbers3)")
+  (let ((-compare-fn #\\='=)) (-union numbers1 numbers2 numbers3)")
 
 (defun -distinct (list)
   "Return a new list with all duplicates removed.