Pablo Carranza Velez 7fe94ec115 docs: Clarify that older supervisors use RESIN_ variables
We add a note on state endpoint docs to use RESIN_ variables. Since users will likely navigate directly to each endpoint, we add the note on the docs for each endpoint, except for endpoints added in >= 7.21.0 (since that version never made it to production).

We also switch some variables that were still referenced as RESIN_ to now use BALENA_.

Change-type: patch
Signed-off-by: Pablo Carranza Velez <pablo@balena.io>
2018-11-30 14:45:10 -03:00
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