Update no-nexus.sh to include descriptive comment

Author: samuel27m

.githooks/no-nexus.sh

@@ -1,5 +1,11 @@
 #! /usr/bin/env bash
 
+# This script ensures that the poetry.lock file does not contain references to the internal Indeed Nexus PyPI repository.
+# It is used as a git hook to automatically remove the [package.source] section for Nexus from poetry.lock.
+# This is necessary to ensure the lock file is portable and open-source friendly.
+# The script uses gsed to remove the Nexus source block and any resulting empty lines, then checks if any changes were made.
+# If Nexus references are found and removed, the script exits with 1 to prevent the commit, so we can stage the changes made by the script before committing again.
+
 gsed -i'' \
     -e '/./{H;$!d}' \
     -e 'x' \