test: link issue and trim the multiline test name

- Drop "strings" from the unit test name.
- Reference issue #637 on the integration workflow step.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

.github/workflows/integration.yml

@@ -103,7 +103,7 @@ jobs:
         env:
           MESSAGE_OUTPUT_TS: ${{ steps.message.outputs.ts }}
 
-      - name: "test(api): post a multiline message"
+      - name: "test(api): post a multiline message" # https://github.com/slackapi/slack-github-action/issues/637
         id: multiline
         uses: ./
         with:

test/content.spec.js

@@ -74,7 +74,7 @@ describe("content", () => {
     /**
      * @see {@link https://github.com/slackapi/slack-github-action/issues/637}
      */
-    it("parses multiline YAML strings from the input payload", async () => {
+    it("parses multiline YAML from the input payload", async () => {
       mocks.core.getInput
         .withArgs("payload")
         .returns('channel: C0123456789\ntext: "first line\n\nsecond line"');