Add quotes to emacsclient arguments in examples

* doc/org-manual.org:
* lisp/org-protocol.el: Quote emacsclient arguments
in examples to prevent interpreting of ampersands as intent
to run processes in background by bash and similar shells.
Single quotes may cause a problem with cmd.exe, so use
double quotes despite they are a bit less safe in bash and Co.

doc/org-manual.org

@@ -19535,7 +19535,7 @@ passed to Emacs through the =emacsclient= command, so you also need to
 ensure an Emacs server is running.  More precisely, when the
 application calls
 
-: emacsclient org-protocol://PROTOCOL?key1=val1&key2=val2
+: emacsclient "org-protocol://PROTOCOL?key1=val1&key2=val2"
 
 #+texinfo: @noindent
 Emacs calls the handler associated to {{{var(PROTOCOL)}}} with
@@ -19558,7 +19558,7 @@ Using the ~store-link~ handler, you can copy links, to that they can
 be inserted using {{{kbd(M-x org-insert-link)}}} or yanking.  More
 precisely, the command
 
-: emacsclient org-protocol://store-link?url=URL&title=TITLE
+: emacsclient "org-protocol://store-link?url=URL&title=TITLE"
 
 #+texinfo: @noindent
 stores the following link:
@@ -19587,7 +19587,7 @@ javascript:location.href='org-protocol://store-link?url='+
 Activating the "capture" handler pops up a =Capture= buffer in Emacs,
 using acapture template.
 
-: emacsclient org-protocol://capture?template=X&url=URL&title=TITLE&body=BODY
+: emacsclient "org-protocol://capture?template=X&url=URL&title=TITLE&body=BODY"
 
 To use this feature, add a bookmark with an arbitrary name, e.g.,
 =Org: capture=, and enter this as =Location=:

lisp/org-protocol.el

@@ -49,7 +49,7 @@
 ;;   4.) Try this from the command line (adjust the URL as needed):
 ;;
 ;;       $ emacsclient \
-;;         org-protocol://store-link?url=http:%2F%2Flocalhost%2Findex.html&title=The%20title
+;;         "org-protocol://store-link?url=http:%2F%2Flocalhost%2Findex.html&title=The%20title"
 ;;
 ;;   5.) Optionally add custom sub-protocols and handlers:
 ;;