docs(cli): --compare-with option help typo (#484)

* docs(cli): --compare-with option help typo

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: rpatterson

src/towncrier/check.py

@@ -38,7 +38,7 @@ def _get_default_compare_branch(branches: Container[str]) -> str | None:
     default=None,
     metavar="BRANCH",
     help=(
-        "Checks files changed running git diff --name-ony BRANCH... "
+        "Checks files changed running git diff --name-only BRANCH... "
         "BRANCH is the branch to be compared with. "
         "Default to origin/main"
     ),

src/towncrier/newsfragments/+docs-compare-with.misc

@@ -0,0 +1 @@
+Fix a minor typo in the example git CLI option flag.