Removes space in hyperlink (#9653)

Simple formatting issue.

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#### PR checklist

- [x] Tests written/updated, or no tests needed
- [x] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [x] Updated relevant documentation (`docs/`) and code comments, or no
      documentation updates needed

STYLE_GUIDE.md

@@ -98,7 +98,7 @@ Sometimes it's necessary to rename libraries to avoid naming collisions or ambig
     * Make use of table driven testing where possible and not-cumbersome
         * [Inspiration](https://dave.cheney.net/2013/06/09/writing-table-driven-tests-in-go)
     * Make use of [assert](https://godoc.org/github.com/stretchr/testify/assert) and [require](https://godoc.org/github.com/stretchr/testify/require)
-* When using mocks, it is recommended to use Testify [mock] (<https://pkg.go.dev/github.com/stretchr/testify/mock>
+* When using mocks, it is recommended to use Testify [mock](<https://pkg.go.dev/github.com/stretchr/testify/mock>
  ) along with [Mockery](https://github.com/vektra/mockery) for autogeneration
 
 ## Errors