style: prettify connector builder contribution pr templates (#15730)

Author: dbgold17

airbyte-connector-builder-server/src/main/resources/contribution_templates/pull-request-edit.md.peb

@@ -2,9 +2,9 @@
 
 This PR updates source {{ connectorName }} ({{ connectorImageName }}).
 
-The contributor provided the following description of the change:
+#### The contributor provided the following description of the change:
 
-{{ contributionDescription }}
+> {{ contributionDescription }}
 
 ## Reviewer checklist
 - [ ] Resolve any merge conflicts and validate file diffs (make sure the PR only includes changes intended by the contributor)

airbyte-connector-builder-server/src/main/resources/contribution_templates/pull-request-new-connector.md.peb

@@ -2,13 +2,13 @@
 
 This PR adds a new connector for source {{ connectorName }} ({{ connectorImageName }}).
 
-Contributor-provided connector description:
+#### Contributor-provided connector description:
 
-{{ connectorDescription }}
+> {{ connectorDescription }}
 
-The contributor provided the following description of the change:
+#### The contributor provided the following description of the change:
 
-{{ contributionDescription }}
+> {{ contributionDescription }}
 
 ## Details