doc: fix grammar errors

doc/api/http.markdown

@@ -354,7 +354,7 @@ which has been transmitted are equal or not.
 ### response.statusCode
 
 When using implicit headers (not calling `response.writeHead()` explicitly), this property
-controls the status code that will be send to the client when the headers get
+controls the status code that will be sent to the client when the headers get
 flushed.
 
 Example:
@@ -452,7 +452,7 @@ emit trailers, with a list of the header fields in its value. E.g.,
 ### response.end([data], [encoding])
 
 This method signals to the server that all of the response headers and body
-has been sent; that server should consider this message complete.
+have been sent; that server should consider this message complete.
 The method, `response.end()`, MUST be called on each
 response.