Update features.yaml

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

features.yaml

@@ -7,7 +7,7 @@
 # `make generate-features` in the root of the repo.
 #
 # The syntax is relatively simple: The root data structure is a mapping, where
-# the keys are treated as group name and the value is mapping that describe
+# the keys are treated as group name and the value is a mapping that describes
 # the contents of the group. In the contents of the group there are two special
 # key names, namely `help` and `features`. The value for the key `help` must
 # be a string that describes what the group contains. The value of the key