[QA][Code Coverage] Team Assignment Docs Update

Author: wayneseymour

src/dev/code_coverage/docs/team_assignment/README.md

@@ -1,8 +1,28 @@
-# Team Assignment Ingestion Pipeline
+# Team Assignments
 
-Team assignment will occur once per ci run.
-Team assignment uses an ingest pipeline.
+Team assignment occurs once per ci run.
 
-The coverage user has the coverage admin role.
+The "orchestration" entry point is a [Jenkinsfile Scripted Pipeline](https://github.com/elastic/kibana/blob/f73bc48b3bbbb5ad2042c1aa267aea2150b7b742/.ci/Jenkinsfile_coverage#L21)  
+This Jenkinsfile runs a [shell script](https://github.com/elastic/kibana/blob/master/src/dev/code_coverage/shell_scripts/generate_team_assignments_and_ingest_coverage.sh#L33) that kicks everything off.
 
-This role must have the rights depicted below ![Cluster Rights](./security_privleges.png)
+## Team Assignment Data File Creation (Before Ingestion)
+We create a data file containing all paths in the repo, with a team assigned.   
+Example Team Assignments Block: 
+```
+src/dev/code_coverage/ingest_coverage/team_assignment/enumerate_patterns.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/enumeration_helpers.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/flush.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/index.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/parse_owners.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/parse_owners_helpers.js kibana-qa
+src/dev/code_coverage/ingest_coverage/team_assignment/parsing_helpers.js kibana-qa
+```
+
+## Team Assignment Data File Usage (During Code Coverage Ingestion) 
+
+
+Subsequently, we use the data file during ingestion.
+We search the data file, for any given "coveredFilePath"
+ - Given the above assignments block, and lets say the "coveredFilePath" during ingestion is 
+   - `src/dev/code_coverage/ingest_coverage/team_assignment/enumerate_patterns.js`
+   - The team assignment would be `kibana-qa`