cmd/go: remove note about GOCACHE=off in docs

This patch removes mention of GOCACHE=off from the help/docs.
It is no longer supported in Go 1.12, per the release notes.

Fixes #29680

Change-Id: I53ab15a62743f2e55ae1d8aa50629b1bf1ae32ad
GitHub-Last-Rev: 31e904f51dece13645696a87b1164d86c984457f
GitHub-Pull-Request: golang/go#29681
Run-TryBot: Elias Naur <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Bryan C. Mills <>
2 files changed
tree: 6671a80e15b0e36382ff75eefbdc989ceb2ebc2f
  1. .gitattributes
  2. .github/
  3. .gitignore
  10. api/
  11. doc/
  12. favicon.ico
  13. lib/
  14. misc/
  15. robots.txt
  16. src/
  17. test/

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