docs/contributing: add missing `

add missing ` in docs/contributing.md

Change-Id: Id19f59177c3ec6f428adaf0a38f56486bd8d0837
GitHub-Last-Rev: 1a21ede
GitHub-Pull-Request: #3711
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/656935
kokoro-CI: kokoro <[email protected]>
Reviewed-by: Hongxiang Jiang <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Madeline Kalil <[email protected]>
Reviewed-by: Jorropo <[email protected]>

Author: Lslightly

docs/contributing.md

@@ -101,7 +101,7 @@ When running them from terminal:
 You can supply environment variables (e.g. `MOCHA_GREP`) by modifying the launch configuration entry's `env` property.
   - `Launch Unit Tests`: runs unit tests in `test/unit` (same as `npm run unit-test`)
   - `Launch Extension Tests`: runs tests in `test/integration` directory (similar to `npm run test` but runs only tests under `test/integration` directory)
-  - `Launch Extension Tests with Gopls`: runs tests in `test/gopls directory (similar to `npm run test` but runs only tests under `test/gopls` directory)
+  - `Launch Extension Tests with Gopls`: runs tests in `test/gopls` directory (similar to `npm run test` but runs only tests under `test/gopls` directory)
 
 When you want to filter tests while debugging, utilize the `MOCAH_GREP` environment variable discussed previously - i.e., set the environment variable in the `env` property of the launch configuration.