help tweaks (#817)

[jdx]

Fixes #815

❯ RTX_GO_SET_GOPATH=1 GOPATH=xyz rtx x -- env | grep GOPATH=
GOPATH=/Users/jdx/.rtx/installs/go/1.20.7/packages
RTX_GO_SET_GOPATH=1
❯ RTX_GO_SET_GOPATH=0 GOPATH=xyz rtx x -- env | grep GOPATH=
GOPATH=xyz
RTX_GO_SET_GOPATH=0
❯ GOPATH=xyz rtx x -- env | grep GOPATH=
GOPATH=xyz
❯ RTX_GO_SET_GOPATH=1 rtx x -- env | grep GOPATH=
RTX_GO_SET_GOPATH=1
GOPATH=/Users/jdx/.rtx/installs/go/1.20.7/packages
❯ RTX_GO_SET_GOPATH=0 rtx x -- env | grep GOPATH=
RTX_GO_SET_GOPATH=0

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: -3.70% ⚠️

Comparison is base (90e32be) 87.60% compared to head (f84b4e3) 83.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #819      +/-   ##
==========================================
- Coverage   87.60%   83.90%   -3.70%     
==========================================
  Files         131      131              
  Lines       11492    11492              
==========================================
- Hits        10067     9642     -425     
- Misses       1425     1850     +425     

Files Changed	Coverage Δ
src/plugins/core/go.rs	76.19% <83.33%> (-12.50%)	⬇️

... and 21 files with indirect coverage changes

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