Add full stop

Author: liamjberrisford

contributing/roles.ipynb

@@ -95,7 +95,7 @@
     "    - Signpost to next steps (e.g. future workshops in the programme that follow on) and where to access help after the end of the workshop (e.g. Research Coding Community on Teams, [Signup Page](community.ipynb)). \n",
     "    - Highlight the importance of the feedback survey. \n",
     "    - Thank participants for supporting the programme. \n",
-    "- If you are unexpectedly unavailable to support delivery of the session while the programme administrator is unavailable, contact the programme directors in the first instance (Dr Fliss Guest & Dr Eilis Hannon), copying in the Coding for Reproducible Research mailbox, so that alternative arrangements can be made\n",
+    "- If you are unexpectedly unavailable to support delivery of the session while the programme administrator is unavailable, contact the programme directors in the first instance (Dr Fliss Guest & Dr Eilis Hannon), copying in the Coding for Reproducible Research mailbox, so that alternative arrangements can be made.\n",
     "\n",
     "### After a workshop \n",
     "\n",