Add signed off to commit (prometheus#1766)

- Fix error string should not be capitalized from [Golang coding convention](https://github.com/golang/go/wiki/CodeReviewComments#error-strings)
- Fix some typos

Signed-off-by: Nguyen Quang Huy <[email protected]>

Author: huynq0911

CHANGELOG.md

@@ -26,7 +26,7 @@ deprecated. API v1 will be removed with Alertmanager release v0.18.0.
 * [FEATURE] Add support for images and links in the PagerDuty notification config (#1559)
 * [FEATURE] Add support for grouping by all labels (#1588)
 * [FEATURE] [amtool] Add timeout support to amtool commands (#1471)
-* [FEATURE] [amtool] Added `config routes` tools for vizualization and testing routes (#1511)
+* [FEATURE] [amtool] Added `config routes` tools for visualization and testing routes (#1511)
 * [FEATURE] [amtool] Support adding alerts using amtool (#1461)
 * [ENHANCEMENT] Add support for --log.format (#1658)
 * [ENHANCEMENT] Add CORS support to API v2 (#1667)

api/v1/api_test.go

@@ -51,7 +51,7 @@ func newFakeAlerts(alerts []*types.Alert, withErr bool) *fakeAlerts {
 		fps:    fps,
 	}
 	if withErr {
-		f.err = errors.New("Error occured")
+		f.err = errors.New("error occurred")
 	}
 	return f
 }

cli/test_routing_test.go

@@ -36,7 +36,7 @@ func checkResolvedReceivers(mainRoute *dispatch.Route, ls client.LabelSet, expec
 		return err
 	}
 	if !reflect.DeepEqual(expectedReceivers, resolvedReceivers) {
-		return fmt.Errorf("Unexpected routing result want: `%s`, got: `%s`", strings.Join(expectedReceivers, ","), strings.Join(resolvedReceivers, ","))
+		return fmt.Errorf("unexpected routing result want: `%s`, got: `%s`", strings.Join(expectedReceivers, ","), strings.Join(resolvedReceivers, ","))
 	}
 	return nil
 }

ui/app/CONTRIBUTING.md

@@ -61,7 +61,7 @@ Your app should be available at `http://localhost:<port>`. Navigate to
 `src/Main.elm`. Any changes to the file system are detected automatically,
 triggering a recompile of the project.
 
-## Commiting changes
+## Committing changes
 
 Before you commit changes, please run `make build-all` on the root level
 Makefile. Please include `asset/*_vfsdata.go` in your commit.