Listed missing HTTP and gRPC endpoint envvars used

[WhitWaldo]

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Description

I noticed that the published page listing the various environment variables was missing two of the values used today: DAPR_HTTP_ENDPOINT and DAPR_GRPC_ENDPOINT, so I've added them to the list.

Issue reference

N/A

[hhunter-ms]

lgtm

[msfussell]

@WhitWaldo - These are great missing additions. See my comments on examples to help developers.

[WhitWaldo]

@msfussell For both examples, I'll come back and edit the language in the docs if/when another PR I created today is accepted and merged.