Merge branch 'jc/doc-synopsis-option-markup'

Doc mark-up fixes. * jc/doc-synopsis-option-markup: git-var doc: fix usage of $ENV_VAR vs ENV_VAR git-verify-* doc: update mark-up of synopsis option descriptions git-{var,write-tree} docs: update mark-up of synopsis option descriptions git-daemon doc: update mark-up of synopsis option descriptions