feat(mkdocs.yaml): update the separator characters (autowarefoundation#10127)

Signed-off-by: Mete Fatih Cırıt <mfc@autoware.org>

Author: xmfcx

mkdocs.yaml

@@ -63,7 +63,9 @@ plugins:
       module_name: mkdocs_macros
   - mkdocs-video
   - same-dir
-  - search
+  # https://squidfunk.github.io/mkdocs-material/plugins/search/#config.separator
+  - search:
+      separator: '[\s\-_,:!=\[\]()"/]+|(?!\b)(?=[A-Z][a-z])|\.(?!\d)|&[lg]t;'
 
 markdown_extensions:
   - abbr