Entries for SRE-related terms

### Severity

Minor (nice to have)

### Priority

P3 (lowest)

### Relevant page(s)

_No response_

### Describe the proposed change

Per convo in Slack, we would like to see SRE-related terms in the SSG

### Why is this change needed?

to clarify correct use/capitalization

### Additional context

Thread: https://redhat-internal.slack.com/archives/C04HKR61MN1/p1770212806561189