doc: fix typos in test.md

PR-URL: #43997
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Feng Yu <F3n67u@outlook.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

doc/api/test.md

@@ -345,7 +345,7 @@ changes:
   * `only` {boolean} If truthy, and the test context is configured to run
     `only` tests, then this test will be run. Otherwise, the test is skipped.
     **Default:** `false`.
-  * `signal` {AbortSignal} Allows aborting an in-progress test
+  * `signal` {AbortSignal} Allows aborting an in-progress test.
   * `skip` {boolean|string} If truthy, the test is skipped. If a string is
     provided, that string is displayed in the test results as the reason for
     skipping the test. **Default:** `false`.
@@ -504,7 +504,8 @@ test('top level test', (t) => {
 added: v18.7.0
 -->
 
-* <AbortSignal> Can be used to abort test subtasks when the test has been aborted.
+* {AbortSignal} Can be used to abort test subtasks when the test has been
+  aborted.
 
 ```js
 test('top level test', async (t) => {
@@ -575,7 +576,7 @@ changes:
   * `only` {boolean} If truthy, and the test context is configured to run
     `only` tests, then this test will be run. Otherwise, the test is skipped.
     **Default:** `false`.
-  * `signal` {AbortSignal} Allows aborting an in-progress test
+  * `signal` {AbortSignal} Allows aborting an in-progress test.
   * `skip` {boolean|string} If truthy, the test is skipped. If a string is
     provided, that string is displayed in the test results as the reason for
     skipping the test. **Default:** `false`.
@@ -622,7 +623,8 @@ exposed as part of the API.
 added: v18.7.0
 -->
 
-* <AbortSignal> Can be used to abort test subtasks when the test has been aborted.
+* {AbortSignal} Can be used to abort test subtasks when the test has been
+  aborted.
 
 [TAP]: https://testanything.org/
 [`--test-only`]: cli.md#--test-only