doc: fix to known issues py script

Updating regex in the py file to match mjs.

Signed-off-by: Bartosz Gentkowski <[email protected]>

doc/_extensions/page_filter.py

@@ -225,7 +225,7 @@ def read_versions(app: Sphinx) -> None:
         with open(VERSIONS_FILE) as version_file:
             nrf_versions = json.loads(version_file.read())
             nrf_versions = list(
-                filter(lambda v: re.match(r"\d\.\d\.\d$", v), nrf_versions)
+                filter(lambda v: re.match(r"\d+\.\d+\.\d+(-.*)?$", v), nrf_versions)
             )
             # Versions classes are on the format "vX-X-X"
             app.env.nrf_versions = [