CBQ documentation should encourage use of -u -p rather than embedded username-password

There are a couple of different ways to present the user-name and password to be used when connecting to Couchbase using the CBQ shell. One is to embed the user-name/password combination in the URL of the engine being pointed to, like this:

cbq -engine=http://test1:pw1@localhost:8093

The other is to present the user-name and password using the -u -p command line options, like this:

cbq -engine=http://localhost:8093 -u test1 -p pw1

Both options currently work for mundane passwords, but only the latter option works for passwords containing odd characters. (See MB-21161.)

Any use of the embedded form for CBQ in our documentation should be converted to the -u -p form.