Existing docs use inline code blocks in many places #1713

Noticed that existing docs use code blocks in many places so tried to follow that even though not supported by godoc. Updated to use quote 😄 Possibly something to consider over time is updating the other spots in the docs that use code block style. For example:

https://github.com/techfg/testify/blob/098128fd102520c289cc5aef04afa388f10998a9/assert/assertions.go#L1592-L1593
https://github.com/techfg/testify/blob/098128fd102520c289cc5aef04afa388f10998a9/require/doc.go#L25-L26

Originally posted by @techfg in #1709 (comment)