Clarify that pure Git migration differs from other migrations

Co-authored-by: Norwin <[email protected]>

Author: delvh

options/locale/locale_en-US.ini

@@ -900,7 +900,7 @@ migrate.migrating = Migrating from <b>%s</b> ...
 migrate.migrating_failed = Migrating from <b>%s</b> failed.
 migrate.migrating_failed.error = Error: %s
 migrate.github.description = Migrate data from github.com or other Github instances.
-migrate.git.description = Migrate data from any Git service.
+migrate.git.description = Migrate a repository only from any Git service.
 migrate.gitlab.description = Migrate data from gitlab.com or other GitLab instances.
 migrate.gitea.description = Migrate data from gitea.com or other Gitea instances.
 migrate.gogs.description = Migrate data from notabug.org or other Gogs instances.