DOCSP-37027: Remove use of post in collection-option-collation (#1266)

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Author: jmikola

docs/includes/extracts-collection-option.yaml

@@ -1,8 +1,11 @@
 ref: collection-option-collation
-source: 
-  ref: common-option-collation
-  file: extracts-common-option.yaml
-post: |
+content: |
+  :manual:`Collation </reference/collation>` allows users to specify
+  language-specific rules for string comparison, such as rules for lettercase
+  and accent marks. When specifying collation, the ``locale`` field is
+  mandatory; all other collation fields are optional. For descriptions of the
+  fields, see :manual:`Collation Document </reference/collation/#collation-document>`.
+
   If the collation is unspecified but the collection has a default collation,
   the operation uses the collation specified for the collection. If no
   collation is specified for the collection or for the operation, MongoDB uses