runtime/pprof: update example comment to check error on Close
Programs should always check the error return of Close for a file opened for writing. Update the example code in the comment to mention this. Change-Id: I2ff6866ff1fe23b47c54268ac8e182210cc876c5 Reviewed-on: https://go-review.googlesource.com/c/go/+/202137Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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