Add SAMS, SSC, and dotcom to the glossary (#8471)

Added three new items to the glossary.

data/glossary.yml

@@ -15,6 +15,10 @@ technical:
     definition: Request for help
   - term: RCE
     definition: Remote code execution (a security vulnerability)
+  - term: SAMS
+    definition: Sourcegraph Access Management System. The system that provides auth for dotcom, SSC, and other services in the future.
+  - term: SSC
+    definition: Self-Serve Cody. The system that lets PLG customers sign up for Sourcegraph and manage their subscription.
   - term: SSRF
     definition: Server side request forgery (a security vulnerability)
   - term: SEO
@@ -75,6 +79,8 @@ technical:
     definition: Level of effort
   - term: FSM
     definition: Finite-state machine. An abstract machine that can be in exactly one of a finite number of states at any given time. See https://en.wikipedia.org/wiki/Finite-state_machine
+  - term: dotcom
+    definition: Sourcegraph.com
   - term: airgapped instance
     definition: Self-hosted customer instance that does not allow any outbound network requests; offline to any external network requests.
   - term: private instance