Fix typos in context.go (#2551)

context.go

@@ -891,7 +891,7 @@ func (c *Context) SecureJSON(code int, obj interface{}) {
 }
 
 // JSONP serializes the given struct as JSON into the response body.
-// It add padding to response body to request data from a server residing in a different domain than the client.
+// It adds padding to response body to request data from a server residing in a different domain than the client.
 // It also sets the Content-Type as "application/javascript".
 func (c *Context) JSONP(code int, obj interface{}) {
 	callback := c.DefaultQuery("callback", "")
@@ -968,7 +968,7 @@ func (c *Context) DataFromReader(code int, contentLength int64, contentType stri
 	})
 }
 
-// File writes the specified file into the body stream in a efficient way.
+// File writes the specified file into the body stream in an efficient way.
 func (c *Context) File(filepath string) {
 	http.ServeFile(c.Writer, c.Request, filepath)
 }