internal/fuzz: fix typo in function comments
internal/fuzz: fix typo in function comments

The correct word to use here is 'retrieve' not 'retrive'

Change-Id: I8de0961a254cf429ddbaf599fe996155e24c7af2
GitHub-Last-Rev: 65aaeec8db14c23e7bc8a62ce9ecfde98a263a49
GitHub-Pull-Request: golang/go#54026
Reviewed-on: https://go-review.googlesource.com/c/go/+/419317
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Reviewed-by: Cherry Mui <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Auto-Submit: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>

nawawi/go,nawawi/go,golang/go,golang/go,nawawi/go,nawawi/go,nawawi/go,golang/go,golang/go,nawawi/go,nawawi/go,golang/go,golang/go,nawawi/go,golang/go,golang/go