Cleanup biomass module realization name

Purpose of this PR

Fix the wrong default name of the biomass module realization in the comment.

(Make sure to delete from the Type-of-change list the items not relevant to your PR)

[x] My code follows the coding etiquette
[x] I performed a self-review of my own code
[x] I explained my changes within the PR, particularly in hard-to-understand areas
[x] I checked that the in-code documentation is up-to-date
[x] I adjusted the reporting in remind2 where it was needed
[x] I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches (NA)
[x] All automated model tests pass (FAIL 0 in the output of make test) (NA)
[x] The changelog CHANGELOG.md has been updated correctly (NA)