i[Trivialfix]Fix typos in ironic-inspector

Fix the typos in ironic-inspector.

Change-Id: I20eabb78b6529b414e0b928eaa7ffe33221145f3

doc/source/user/http-api.rst

@@ -338,7 +338,7 @@ API Discovery
 ~~~~~~~~~~~~~
 
 The API supports API discovery. You can query different parts of the API to
-discover what other endpoints are avaliable.
+discover what other endpoints are available.
 
 * ``GET /`` List API Versions
 

ironic_inspector/test/unit/test_main.py

@@ -570,7 +570,7 @@ class TestApiVersions(BaseAPITest):
     def test_usual_requests(self, get_mock):
         get_mock.return_value = node_cache.NodeInfo(uuid=self.uuid,
                                                     started_at=42.0)
-        # Successfull
+        # Successful
         self._check_version_present(
             self.app.post('/v1/introspection/%s' % self.uuid))
         # With error