docs: `eqwalizer_support` as a dependency under the `test` profile

[javiergarea]

The current documentation states that eqwalizer_support must be listed under the deps section in rebar.config. This suggests that the source code for eqwalizer_support will be included in every project's compilation. However, I found that the elp command still works when this dependency is specified under the test profile.

eqwalizer/eqwalizer/build.sbt

Lines 67 to 68 in bb47c23

	run("rebar3 as test compile")
	run("rebar3 as test build_info --to ../test_projects.build_info")

The documentation should be updated to reflect it.