fix condition for running documentation GitHub action on Helm updates

A spurious slash at the end of the pattern for files to watch for changes
in the description of the GitHub workflow prevented the action to run
on all changes of the Helm values. Fix it.

Fixes: 4e5272b ("docs: run GitHub action when Charts are touched to check Helm values ref")
Fixes: #16577
Signed-off-by: Quentin Monnet <quentin@isovalent.com>

.github/workflows/documentation.yaml

@@ -35,7 +35,7 @@ jobs:
               - 'cilium-health/cmd/**'
               - 'daemon/cmd/**'
               - 'hubble-relay/cmd/**'
-              - 'install/kubernetes/**/'
+              - 'install/kubernetes/**'
               - 'operator/cmd/**'
 
   # Runs only if code under Documentation or */cmd/ is changed as the docs