Improve Erlang release version detection

[deadok22]

Currently, Erlang 17.1 and Erlang 17.3 releases are indistinguishable from Erlang 17.

This leads to incorrect default documentation paths and to syntax compatibility issues in future.

There are two approaches to determine which Erlang release we are dealing with:

• Scan SDK's directory structure and parse release info from RELEASES, OTP_VERSION or some other file. (this approach is used now and it's not very convenient as directory structure varies in different releases)
• Parse release info from output of some command like erl +V or erl -version (these two allow for ERTS version detection only so some other command should be issued)