Add title clickable to go to spyOn accessType for API doc (#5404)

Author: ahnpnl

docs/JestObjectAPI.md

@@ -32,6 +32,7 @@ behavior.
 * [`jest.useFakeTimers()`](#jestusefaketimers)
 * [`jest.useRealTimers()`](#jestuserealtimers)
 * [`jest.spyOn(object, methodName)`](#jestspyonobject-methodname)
+* [`jest.spyOn(object, methodName, accessType?)`](#jestspyonobject-methodname-accesstype)
 
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