Update README.md (#9886)

changed capitalization on osquery for consistency

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [ ] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [ ] Documented any API changes (docs/Using-Fleet/REST-API.md or
docs/Contributing/API-for-contributors.md)
- [ ] Documented any permissions changes
- [ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [ ] Added support on fleet's osquery simulator `cmd/osquery-perf` for
new osquery data ingestion features.
- [ ] Added/updated tests
- [ ] Manual QA for all new/changed functionality
  - For Orbit and Fleet Desktop changes:
- [ ] Manual QA must be performed in the three main OSs, macOS, Windows
and Linux.
- [ ] Auto-update manual QA, from released version of component to new
version (see [tools/tuf/test](../tools/tuf/test/README.md)).

handbook/marketing/README.md

@@ -117,7 +117,7 @@ Once a relevant sponsorship opportunity and its prospectus are reviewed:
 
 Fleet's users and broader audience are spread across many online platforms. Here are the most active communities where Fleet's developer relations and social media team members participate at least once every weekday:
 
-- [Osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw) (`#fleet` channel)
+- [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw) (`#fleet` channel)
 - [MacAdmins Slack](https://www.macadmins.org/) (`#fleet` channel)
 - [osquery discussions on LinkedIn](https://www.linkedin.com/search/results/all/?keywords=osquery)
 - [osquery discussions on Twitter](https://twitter.com/search?q=osquery&src=typed_query)