[WIP] CB-14249 ensure platform changes are in a dev version (partial workaround doc fix)

Platforms affected

All

What does this PR do?

Add section with note to ensure that changes are made in a "-dev" version.

This is a partial workaround for the fundamental issue in CB-14249, contributed in response to the discussion in https://github.com/apache/cordova-android/pull/469. This kind of workaround was already applied in https://github.com/apache/cordova-android/pull/470, https://github.com/apache/cordova-ios/pull/379, https://github.com/apache/cordova-android/pull/454, and several other places.

I hope we can resolve the inconsistency in release procedure for platforms vs tools described in CB-14249 someday, with agreement via dev@cordova.apache.org. I cannot promise when I will get a chance to take care of this.

TODO:

[ ] get rid of the "manually" option
[ ] show the needed coho command

Unfortunately I think I need some of the changes from #188 to make the coho prepare-platform-release-branch command work as needed on the non-master branch. I hope I get a chance to cleanup some of the changes from #188 and fix this one in the near future.

Merge procedure

Should be merged by squash (second commit is there to splve a problem with the first commit)

What testing has been done on this change?

Quick visual check

Checklist

[x] Reported an issue in the JIRA database
[x] Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected. (not true for second commit, which should be squashed anyway)
~~Added automated test coverage as appropriate for this change.~~

apache / cordova-coho