BetterDocs offers the white-labeling option. So, you can easily remove Branding for any package in BetterDocs. For Single Article, you can disable it from Layout Settings.
Go to WordPress Dashboard -> BetterDocs -> Layout. From ‘Single Doc’ section, you can disable Credit from here. Make sure to hit on the ‘Save Settings’.
To remove branding from ‘Instant Answer’, go to WordPress Dashboard -> BetterDocs -> Instant Answer.
Then, from the ‘Appearance Settings’, make sure to enable the ‘Disabled Branding’ option.
Hit on the ‘Save Settings’. BetterDocs branding will be removed from Instant Answer as a result.