health_check_using_rpc: refine docs

src/brpc/socket.cpp

@@ -97,13 +97,12 @@ DEFINE_int32(connect_timeout_as_unreachable, 3,
              "fails the main socket as well when this socket is pooled.");
 
 DEFINE_string(health_check_path, "", "Http path of health check call."
-        "By default health check succeeds if server can be connected. If this"
-        "flag is set, health check is completed not only when server can be"
-        "connected but also an additional http call succeeds indicated by this"
-        "flag and FLAGS_health_check_timeout_ms");
-DEFINE_int32(health_check_timeout_ms, 500, "Timeout of health check."
-        "If FLAGS_health_check_path is empty, it means timeout of connect."
-        "Otherwise it means timeout of app health check call.");
+        "By default health check succeeds if the server is connectable."
+        "If this flag is set, health check is not completed until a http "
+        "call to the path succeeds within -health_check_timeout_ms(to make "
+        "sure the server functions well).");
+DEFINE_int32(health_check_timeout_ms, 500, "The timeout for both establishing "
+        "the connection and the http call to -health_check_path over the connection");
 
 static bool validate_connect_timeout_as_unreachable(const char*, int32_t v) {
     return v >= 2 && v < 1000/*large enough*/;