Improved estimation issue example for Manage
In Manage's GC, one of the links could have pointed to a better example. (https://docs.google.com/document/u/1/d/1C5H8V_MnW67-_1_SV3n9lS1aTvVBK5RgoqauAUKM82Y/edit). This fixes that.
Edited by Jeremy Watson (ex-GitLab)