docs: update error responses

Author: DevelopmentCats

action.yaml

@@ -33,11 +33,11 @@ inputs:
     required: true
 
   github-user-id:
-    description: "GitHub user ID to create task for. Required unless coder-username is provided."
+    description: "GitHub user ID to create task for. If provided, `coder-username` must not be set."
     required: false
 
   coder-username:
-    description: "Coder username to create task for. If provided, github-user-id is not required. Useful for automated workflows without a triggering user."
+    description: "Coder username to create task for. If provided, github-user-id must not be set. Useful for automated workflows without a triggering user."
     required: false
 
   # Optional inputs

src/action.test.ts

@@ -418,7 +418,6 @@ describe("CoderTaskAction", () => {
 		assertActionOutputs(parsedResult, true);
 	});
 
-
 	test("sends prompt to existing task", async () => {
 		// Setup
 		coderClient.mockGetCoderUserByGithubID.mockResolvedValue(mockUser);