chore(docs): add process diagram for Courtesy Cards

docs/use-cases/courtesy-cards.md

@@ -35,3 +35,26 @@ Notes:
 - [Eligibility Server documentation](https://docs.calitp.org/eligibility-server/)
 - [More details about the Benefits architecture](../deployment/infrastructure/#architecture)
 - Velocity is the system MST uses to manage Courtesy Cards
+
+## Process
+
+```mermaid
+sequenceDiagram
+    actor Rider
+    participant Benefits as Benefits app
+    participant elig_server as Eligibility Server
+    participant cc_data as Hashed data
+    participant Velocity
+    participant Littlepay
+
+    Velocity-->>cc_data: exports nightly
+    cc_data-->>elig_server: gets loaded on Server start
+
+    Rider->>Benefits: visits site
+    Benefits-->>elig_server: passes entered Courtesy Card details
+    elig_server-->>Benefits: confirms eligibility
+
+    Benefits-->>Littlepay: enrollment start
+    Rider->>Littlepay: enters payment card details
+    Littlepay-->>Benefits: enrollment complete
+```

docs/use-cases/seniors.md

@@ -14,19 +14,19 @@ Here's a GIF showing what the flow looks like, having seniors confirm eligibilit
 
 ```mermaid
 sequenceDiagram
-    actor rider
+    actor Rider
     participant Benefits as Benefits app
     participant IdG as Identity Gateway
     participant Login.gov
     participant Littlepay
 
-    rider->>Benefits: visits site
+    Rider->>Benefits: visits site
     Benefits-->>IdG: identity proofing
     IdG-->>Login.gov: identity proofing
-    rider->>Login.gov: enters SSN and ID
+    Rider->>Login.gov: enters SSN and ID
     Login.gov-->>IdG: eligibility verification
     IdG-->>Benefits: eligibility verification
     Benefits-->>Littlepay: enrollment start
-    rider->>Littlepay: enters payment card details
+    Rider->>Littlepay: enters payment card details
     Littlepay-->>Benefits: enrollment complete
 ```