kernel: README: remove trailing '.' from a title
We don't append fullstops to section titles, and they mess the
ToC up (looks wise). Nuke the one we had in this file.
@@ -49,7 +49,7 @@ Kata Containers packaging repository holds the kernel configs and patches. The
config and patches can work for many versions, but we only test the
kernel version defined in the [runtime versions file][runtime-versions-file].
-## How is it tested.
+## How is it tested
The Kata Containers CI scripts install the kernel from [CI cache
job][cache-job] or build from sources.
