Fix up markdown

Author: znichollscr

docs/forcings-email-archive/2026-03-20.md

@@ -1,11 +1,18 @@
 # 2026-03-20 update
 
-There is an update to the nitrogen deposition data (new data is published under source ID FZJ-CMIP-nitrogen-2-0). However, if you already have simulations that use the previous version (source ID FZJ-CMIP-nitrogen-1-2`), you do not need to re-run. Further details below and at https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/
+There is an update to the nitrogen deposition data (new data is published under source ID `FZJ-CMIP-nitrogen-2-0`).
+However, if you already have simulations that use the previous version (source ID `FZJ-CMIP-nitrogen-1-2`), you do not need to re-run.
+Further details below and at [https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/](https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/).
+
+As a result of an issue being found ([#425](https://github.com/PCMDI/input4MIPs_CVs/issues/425)),
+a new version of the nitrogen deposition forcing has been released.
 
-As a result of an issue being found (#425), a new version of the nitrogen deposition forcing has been released.
 * Modelling centres who have already run their piControl and/or historical simulations do not need to re-run.
-* Modelling centres who have not yet started their piControl and/or historical simulations should use the FZJ-CMIP-nitrogen-2-0 data.
-For further details about the error and recommended action, please see the nitrogen deposition dataset page https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/.
+* Modelling centres who have not yet started their piControl and/or historical simulations should use the `FZJ-CMIP-nitrogen-2-0` data.
+
+For further details about the error and recommended action,
+please see the nitrogen deposition dataset page [https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/](https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/nitrogen-deposition/).
 
-If any modelling centres run piControl and/or historical simulations with both the FZJ-CMIP-nitrogen-2-0 and FZJ-CMIP-nitrogen-1-2 forcing,
-these simulations would be of interest to the Forcings Task Team. ([#427](https://github.com/PCMDI/input4MIPs_CVs/pull/427))
+If any modelling centres run piControl and/or historical simulations with both the `FZJ-CMIP-nitrogen-2-0` and `FZJ-CMIP-nitrogen-1-2` forcing,
+these simulations would be of interest to the Forcings Task Team.
+(Underlying pull request: [#427](https://github.com/PCMDI/input4MIPs_CVs/pull/427))