license-expectations: Fix typo

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>

content/policies/license-expectations.md

@@ -66,7 +66,7 @@ requirement to ensure that the hardware runs verified software.
 ## Original 4 clause BSD license
 
 The [BSD-4-Clause](https://spdx.org/licenses/BSD-4-Clause.html) license still
-contains the problematic advertisment clause that was dropped in later versions
+contains the problematic advertisement clause that was dropped in later versions
 and is thus to be avoided in Apertis.
 
 The original authors of the license retroactively deleted the problematic