Fix double spaced sentences

Sentences should be split by single spaces
only. Fixing in /development and /administration

doc/development/go_guide/index.md

@@ -188,9 +188,9 @@ code readability and test output.
 ### Better output in tests
 
 When comparing expected and actual values in tests, use
-[testify/require.Equal](https://godoc.org/github.com/stretchr/testify/require#Equal),
-[testify/require.EqualError](https://godoc.org/github.com/stretchr/testify/require#EqualError),
-[testify/require.EqualValues](https://godoc.org/github.com/stretchr/testify/require#EqualValues),
+[`testify/require.Equal`](https://godoc.org/github.com/stretchr/testify/require#Equal),
+[`testify/require.EqualError`](https://godoc.org/github.com/stretchr/testify/require#EqualError),
+[`testify/require.EqualValues`](https://godoc.org/github.com/stretchr/testify/require#EqualValues),
 and others to improve readability when comparing structs, errors,
 large portions of text, or JSON documents:
 

doc/development/testing_guide/best_practices.md

@@ -536,7 +536,7 @@ reset before each example, add the `:prometheus` tag to the Rspec test.
 ### Matchers
 
 Custom matchers should be created to clarify the intent and/or hide the
-complexity of RSpec expectations.They should be placed under
+complexity of RSpec expectations. They should be placed under
 `spec/support/matchers/`. Matchers can be placed in subfolder if they apply to
 a certain type of specs only (e.g. features, requests etc.) but shouldn't be if
 they apply to multiple type of specs.