go/analysis/analysistest: fix word usage
go/analysis/analysistest: fix word usage

Change-Id: Iec304e44375b0740b8bc594cfe6ce35637284555
Reviewed-on: https://go-review.googlesource.com/c/tools/+/175939
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools