Replace with "Phone Type"

Remove ambiguity regarding phone number versus mobile phone number. And fix a couple of typos too.

Follow-up PR to fix the interline spacing, sorry about that!

Add WordPress URL example for "A message comes in webhook"

Worked on the following sections: Case Management, SMS, Initial set up, Survey, Reporting

Also did a little bit of minor tidying up and made image links absolute references

Replace 'Wordpress' with 'WordPress' to use correct camel casing according to the WordPress Wordmark and Trademark

There's a pending feature to enable the use of more than one long number.  This change should get approved when (if?) the pending feature is merged. See: https://issues.civicrm.org/jira/browse/CRM-21138

The parameters should be separated by an equals sign, not a colon.

Also, the Clickatell extension looks for the `mo=1` parameter and if it finds it, it will include a callback parameter to clickatell. However, the twilio code has no such equivalent.

https://docs.civicrm.org/dev/en/latest/documentation/style-guide/#describing-the-civicrm-user-interface

The use of ATX headers (aka "hash syntax" is part of our markdown
standards as defined here:
https://docs.civicrm.org/dev/en/latest/markdownrules/#standards

To make this change, I did the following:
perl -0777 -i -pe 's|^(.*)\n-{3,}$|## $1|gm' `find . -name '*.md'`
perl -0777 -i -pe 's|^(.*)\n={3,}$|# $1|gm' `find . -name '*.md'`

I also tested the built HTML files before/after using git to make sure
that nothing actually changed in the build as a result of this commit

Adding steps to get the account working after upgrading from a working test account to a paid account.  Some of this was found in the Wiki pages, but the HTTP Get on the reply path was trial and error.  I've not included images since the setup page pulls in things like phone number and api_id that are not changeable.

Clickatell has changed their layouts and a few of the questions.  A new image also needs to be taken and inserted.