[MONGOSH-935] PlanCache does not work on 4.0 - MongoDB Jira

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Documentation Changes:
Needed
Documentation Changes Summary:

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We should document that the {{PlanCache}} class in mongosh does not support the {{.list()}} method on 4.0 servers.

Those who do need to access the plan cache in some form on 4.0 servers can currently do so by running the {{planCacheListQueryShapes}} command manually.

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We should document that the {{PlanCache}} class in mongosh does not support the {{.list()}} method on 4.0 servers. Those who do need to access the plan cache in some form on 4.0 servers can currently do so by running the {{planCacheListQueryShapes}} command manually.

We use $planCacheStats in the PlanCache class, which is only available in 4.2+ on the server side.

~~MONGOSH-938~~ also has steps to reproduce.

is duplicated by

MONGOSH-938 mongosh methods cannot list the plan cache in MongoDB 4.0

is related to

MONGOSH-937 Incorrect name for deprecated function listed in help()