doc: fix typo in test.md

Signed-off-by: Rich Trott <[email protected]>

Author: Trott

doc/api/test.md

@@ -1703,7 +1703,7 @@ changes:
     coverage does not reach the threshold specified, the process will exit with code `1`.
     **Default:** `0`.
   * `env` {Object} Specify environment variables to be passed along to the test process.
-    This options is not compatible with `isolation='none'`. These variables will override
+    This option is not compatible with `isolation='none'`. These variables will override
     those from the main process, and are not merged with `process.env`.
     **Default:** `process.env`.
 * Returns: {TestsStream}