Escape ` and ' in doc

Escape apostrophes and grave accents in docstrings if they are
are supposed to stand for themselves and are not quotes.  Remove
apostrophes from docstring examples like ‘'(calendar-nth-named-day
-1 0 10 year)’ that confuse source code with data.  Do some other
minor docstring fixups as well, e.g., insert a missing close
quote.

lisp/erc/erc-backend.el

@@ -1082,7 +1082,7 @@ As an example:
 Would expand to:
 
   (prog2
-      (defvar erc-server-311-functions 'erc-server-311
+      (defvar erc-server-311-functions \\='erc-server-311
         \"Some non-generic variable documentation.
 
   Hook called upon receiving a 311 server response.

lisp/erc/erc-networks.el

@@ -782,9 +782,9 @@ PORTS should be a list of either:
   numbers between LOW and HIGH (inclusive) is returned.
 
 As an example:
-  (erc-ports-list '(1)) => (1)
-  (erc-ports-list '((1 5))) => (1 2 3 4 5)
-  (erc-ports-list '(1 (3 5))) => (1 3 4 5)"
+  (erc-ports-list \\='(1)) => (1)
+  (erc-ports-list \\='((1 5))) => (1 2 3 4 5)
+  (erc-ports-list \\='(1 (3 5))) => (1 3 4 5)"
   (let (result)
     (dolist (p ports)
       (cond ((numberp p)
@@ -866,4 +866,3 @@ VALUE is the options value.")
 ;; indent-tabs-mode: t
 ;; tab-width: 8
 ;; End:
-

lisp/erc/erc-services.el

@@ -172,7 +172,7 @@ You can also use M-x erc-nickserv-identify-mode to change modes."
 
 Example of use:
   (setq erc-nickserv-passwords
-        '((freenode ((\"nick-one\" . \"password\")
+        \\='((freenode ((\"nick-one\" . \"password\")
                      (\"nick-two\" . \"password\")))
           (DALnet ((\"nick\" . \"password\")))))"
   :group 'erc-services

lisp/erc/erc.el

@@ -927,7 +927,7 @@ If no elements match, then the empty string is used.
 
 As an example:
   (setq erc-quit-reason-various-alist
-      '((\"xmms\" dme:now-playing)
+      \\='((\"xmms\" dme:now-playing)
         (\"version\" erc-quit-reason-normal)
         (\"home\" \"Gone home !\")
         (\"^$\" \"Default Reason\")))
@@ -950,7 +950,7 @@ If no elements match, then the empty string is used.
 
 As an example:
   (setq erc-part-reason-various-alist
-      '((\"xmms\" dme:now-playing)
+      \\='((\"xmms\" dme:now-playing)
         (\"version\" erc-part-reason-normal)
         (\"home\" \"Gone home !\")
         (\"^$\" \"Default Reason\")))