cmd/go/internal/cache: fix GODEBUG name in comments

The comments reference GODEBUG=goverifycache=1 but the actual
setting name is gocacheverify (as used in the code, tests, and
documentation throughout the repository).

This typo was introduced in CL 558301a when the Cache interface
was abstracted, and the word order was accidentally flipped in
three comment locations.

Change-Id: Id260923e2f0ccae86e77d6440143a9ab6c5732d4
GitHub-Last-Rev: 5247b5d
GitHub-Pull-Request: #80565
Reviewed-on: https://go-review.googlesource.com/c/go/+/805541
Auto-Submit: Sean Liao <sean@liao.dev>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>

Author: alvinjaison

src/cmd/go/internal/cache/cache.go

@@ -48,7 +48,7 @@ type Cache interface {
 	// the seek position is not guaranteed to be in any particular state.
 	//
 	// As a special case, if the ReadSeeker is of type noVerifyReadSeeker,
-	// the verification from GODEBUG=goverifycache=1 is skipped.
+	// the verification from GODEBUG=gocacheverify=1 is skipped.
 	//
 	// After a successful call to Put, OutputFile(OutputID) must
 	// exist on disk until Close is called (at the end of the process).
@@ -524,7 +524,7 @@ func (c *DiskCache) putIndexEntry(id ActionID, out OutputID, size int64, allowVe
 
 // noVerifyReadSeeker is an io.ReadSeeker wrapper sentinel type
 // that says that Cache.Put should skip the verify check
-// (from GODEBUG=goverifycache=1).
+// (from GODEBUG=gocacheverify=1).
 type noVerifyReadSeeker struct {
 	io.ReadSeeker
 }
@@ -554,7 +554,7 @@ func (c *DiskCache) PutExecutable(id ActionID, name string, file io.ReadSeeker)
 }
 
 // PutNoVerify is like Put but disables the verify check
-// when GODEBUG=goverifycache=1 is set.
+// when GODEBUG=gocacheverify=1 is set.
 // It is meant for data that is OK to cache but that we expect to vary slightly from run to run,
 // like test output containing times and the like.
 func PutNoVerify(c Cache, id ActionID, file io.ReadSeeker) (OutputID, int64, error) {