Apply Go 1.19 specific doc comments linting fixes

Remove stray whitespace per Go 1.19 fmt linting rules.

adaptivecard/adaptivecard.go

@@ -535,7 +535,6 @@ type Container Element
 
 // FactSet is an Element type that groups and displays a series of facts (i.e.
 // name/value pairs) in a tabular form.
-//
 type FactSet Element
 
 // Columns is a collection of Column values.

adaptivecard/doc.go

@@ -27,6 +27,5 @@ https://docs.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/
 https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using
 https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using#send-adaptive-cards-using-an-incoming-webhook
 https://stackoverflow.com/questions/50753072/microsoft-teams-webhook-generating-400-for-adaptive-card
-
 */
 package adaptivecard

internal/validator/doc.go

@@ -14,6 +14,5 @@ Credit to Fabrizio Milo for sharing the original implementation:
 
 - https://stackoverflow.com/a/23960293/903870
 - https://github.com/Mistobaan
-
 */
 package validator