Clarify 24x7 Support plan name (#1318)

<!-- Explain the changes introduced in your PR -->

## Pull Request approval

You will need to get your PR approved by at least one member of the
Sourcegraph team. For reviews of docs formatting, styles, and component
usage, please tag the docs team via the #docs Slack channel.

Author: enriquegh

docs/sla/index.mdx

@@ -109,9 +109,9 @@ Purchasing Premium Support provides several of the following services beyond tho
 
 ### Premium Support Packages
 
-### Package 1: Premium Support SLAs
+### Package 1: Premium SLAs
 
-Premium Support SLAs give customers access to our Support team 24x7 for Severity 0 and 1 issues that critically impact your instance and ability to use Sourcegraph.
+Premium SLAs give customers access to our Support team 24x7 for Severity 0 and 1 issues that critically impact your instance and ability to use Sourcegraph.
 
 First response times remain the same according to our SLAs. However, Emergency and Severe Impact issues are supported 24x7 with Premium Support (versus 24x5 without Premium Support).