Added http 102, 103, 421, and 425 status codes in documentation (#8763)

Author: blablatdinov

docs/api-guide/status-codes.md

@@ -41,6 +41,8 @@ This class of status code indicates a provisional response.  There are no 1xx st
 
     HTTP_100_CONTINUE
     HTTP_101_SWITCHING_PROTOCOLS
+    HTTP_102_PROCESSING
+    HTTP_103_EARLY_HINTS
 
 ## Successful - 2xx
 
@@ -93,9 +95,11 @@ The 4xx class of status code is intended for cases in which the client seems to
     HTTP_415_UNSUPPORTED_MEDIA_TYPE
     HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE
     HTTP_417_EXPECTATION_FAILED
+    HTTP_421_MISDIRECTED_REQUEST
     HTTP_422_UNPROCESSABLE_ENTITY
     HTTP_423_LOCKED
     HTTP_424_FAILED_DEPENDENCY
+    HTTP_425_TOO_EARLY
     HTTP_426_UPGRADE_REQUIRED
     HTTP_428_PRECONDITION_REQUIRED
     HTTP_429_TOO_MANY_REQUESTS