Apply suggestions from code review

Co-authored-by: Simon Pasquier <[email protected]>

README.md

@@ -43,7 +43,7 @@ This is enforced for any case, whether a label matcher is specified in the origi
 
 ### Metadata endpoints
 
-Similar to query endpoint, for metadata endpoints `/api/v1/series`, `/api/v1/labels`, `/api/v1/label/<name>/values` the proxy inject the specified label in the `match` selector. 
+Similar to query endpoint, for metadata endpoints `/api/v1/series`, `/api/v1/labels`, `/api/v1/label/<name>/values` the proxy injects the specified label in the `match` selector. 
 
 NOTE: At the moment of creation `/api/v1/labels`, `/api/v1/label/<name>/values` does not support `match[]` so they are disabled by default. Use `-enable-label-apis` flag to enable 
 those (see https://github.com/prometheus/prometheus/issues/6178 for tracking development).

injectproxy/routes.go

@@ -77,7 +77,7 @@ func NewRoutes(upstream *url.URL, label string, opts ...Option) *routes {
 	if opt.enableLabelAPIs {
 		mux.Handle("/api/v1/labels", enforceMethods(r.matcher, "GET"))
 		// Full path is /api/v1/label/<label_name>/values but http mux does not support patterns.
-		// This is fine though as don't care about name for matcher injector.
+		// This is fine though as we don't care about name for matcher injector.
 		mux.Handle("/api/v1/label/", enforceMethods(r.matcher, "GET"))
 	}