doc: add tip for session.post function

Author: theanarkh

doc/api/inspector.md

@@ -325,6 +325,10 @@ by V8. Chrome DevTools Protocol domain provides an interface for interacting
 with one of the runtime agents used to inspect the application state and listen
 to the run-time events.
 
+Note that, you can not set `reportProgress` to `true` when sending a
+`HeapProfiler.takeHeapSnapshot` or `HeapProfiler.stopTrackingHeapObjects`
+command to V8.
+
 #### Example usage
 
 Apart from the debugger, various V8 Profilers are available through the DevTools

doc/api/v8.md

@@ -1081,7 +1081,7 @@ Start collecting GC data.
 added: REPLACEME
 -->
 
-Stop collecting GC data and return a object.The content of object
+Stop collecting GC data and return an object.The content of object
 is as follows.
 
 ```json