docs: better comment in strictNullCheck action (#3198)

## About the changes
This is a small improvement adding more context to the comment message
when this action fails. 

---------

Co-authored-by: Thomas Heartman <thomas@getunleash.ai>

.github/workflows/gradual-strict-null-checks.yml

@@ -66,7 +66,7 @@ jobs:
           MAIN=$(grep "Found [0-9]* errors" .out-main | sed 's/Found \(.*\) errors in .* files./\1/')
 
           if [ $CURRENT -gt $MAIN ]; then
-            comment "After enabling strictNullChecks this PR would be increasing the number of null check errors from ${MAIN} to ${CURRENT}. Make sure your branch is up-to-date with ${MAIN_BRANCH} and check the diff in the console output to gather more details"
+            comment "After enabling [\`strictNullChecks\`](https://www.typescriptlang.org/tsconfig#strictNullChecks) this PR would be **increasing** the number of null check errors from ${MAIN} to ${CURRENT}. <br /> Make sure your branch is up-to-date with ${MAIN_BRANCH} and **check the diff in the console output** to gather more details."
             diff .out-current .out-main
             exit 1
           else