Update the sales statement for introduction (#13843)

# 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 (docs/Using
Fleet/manage-access.md)
- [ ] 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)).

Co-authored-by: Sampfluger88 <108141731+Sampfluger88@users.noreply.github.com>

handbook/customers/README.md

@@ -3,7 +3,8 @@
 This handbook page details processes specific to working [with](#contact-us) and [within](#responsibilities) this department.
 
 ## What we do
-TODO
+The Sales department is directly responsible for attaining the revenue goals of Fleet and helping to deliver upon our customers' objectives.
+
 
 ## Team
 | Role                                | Contributor(s)           |