chore(nns): Add TODO back to proposal texts to add human-readable sum…

…mary before submitting (#3068)

This helps engineers remember to add the summary to the proposal, until
we have automation to do it for us.

testnet/tools/nns-tools/lib/proposals.sh

@@ -47,6 +47,10 @@ __Target canister__: [$CANISTER_ID](https://dashboard.internetcomputer.org/canis
 
 [new-commit]: https://github.com/dfinity/ic/tree/$NEXT_COMMIT
 
+## Summary
+
+TODO add a summary of changes
+
 ## New Commits
 
 \`\`\`
@@ -140,6 +144,10 @@ __Source code__: [$NEXT_COMMIT][new-commit]
 
 [new-commit]: https://github.com/dfinity/ic/tree/$NEXT_COMMIT
 
+## Summary
+
+TODO add a summary of changes
+
 ## New Commits
 
 \`\`\`
@@ -254,6 +262,10 @@ __Source code__: [$NEXT_COMMIT][new-commit]
 
 [new-commit]: https://github.com/dfinity/ic/tree/$NEXT_COMMIT
 
+## Summary
+
+TODO add a summary of changes
+
 
 ## New Commits