Update the documentation to include the newly added Job in build.yaml

[vaisakhkannan]

One more new job fetch_merge_commit_sha_from_lsp4ij_PR has been added to the build.yaml file due to the fix in PR #1014 for the issue #998.
Update the documentation based on the build results as well.

[vaisakhkannan]

I can update the documentation once I merged this PR #1218.