DOCS-10272: According to the Jira, I changed the definition of caseFirst from boolean to string in the table describing the option.

Irene Smith · Irene Smith · commit d90c9dadb8db · 2017-10-12T14:10:43.000-04:00
diff --git a/source/includes/apiargs-option-collation-fields.yaml b/source/includes/apiargs-option-collation-fields.yaml
@@ -126,7 +126,7 @@ description: |
           for details of differences.
 
 optional: true
-type: boolean
+type: string
 interface: option
 operation: collation
 ---
