x/pkgsite: Super small typo in documentation of ShouldNotBeBlank

[kamyarghiam]

What is the URL of the page with the issue?

https://pkg.go.dev/github.com/smartystreets/assertions#section-readme

What is your user agent?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Screenshot

What did you do?

What did you expect to see?

There is a typo with the definition of "ShouldNotBeBlank," I believe. The definition says
ShouldNotBeBlank receives exactly 1 string parameter and ensures that it is equal to "". It should say that it ensures it is not equal to "".

What did you see instead?

ShouldNotBeBlank receives exactly 1 string parameter and ensures that it is not equal to "".

[seankhliao]

this should be reported to github.com/smartystreets/assertions