Shorten Preview conversation part type filter parameter descriptions (#686)

The 422 response examples already cover the error cases and the schema
already states the 50-value limit, so each description is cut to two
sentences. The 422 example now uses an obviously invalid name.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: robertlangner-fin

descriptions/0/api.intercom.io.yaml

@@ -12715,7 +12715,7 @@ paths:
       - name: include_part_types
         in: query
         required: false
-        description: A comma-separated list of conversation part types to keep; only parts of these types are returned. Values are the names this version returns in a part's `part_type` field, such as `assignment`, `note` or `snoozed`; an unrecognised name returns a 422 rather than being silently ignored, so a typo fails loudly instead of filtering nothing. Two names need care — a part type this version does not recognise is returned as `unknown`, and `unknown` is not itself an accepted filter value, so those parts are removed by naming the types you do want rather than by filtering them out directly; and the part type that versions below 2.6 return as `note_and_reopen` is named `note_and_unsnooze` here. Up to 50 values are accepted, and `include_part_types` cannot be combined with `exclude_part_types`; both cases return a 422. Supply one comma-separated value; repeating the parameter is not read as a combined list, and only the last occurrence is used. The filter is applied before the conversation parts limit, so the newest matching parts are returned. Available on the Preview version; a 422 is returned on any other version.
+        description: A comma-separated list of conversation part types to return, such as `assignment`, `note` or `snoozed`. Cannot be combined with `exclude_part_types`.
         example: comment,note
         schema:
           type: array
@@ -12728,7 +12728,7 @@ paths:
       - name: exclude_part_types
         in: query
         required: false
-        description: A comma-separated list of conversation part types to drop; parts of these types are omitted and all others are returned. Values are the names this version returns in a part's `part_type` field, such as `assignment`, `note` or `snoozed`; an unrecognised name returns a 422 rather than being silently ignored, so a typo fails loudly instead of filtering nothing. Two names need care — a part type this version does not recognise is returned as `unknown`, and `unknown` is not itself an accepted filter value, so those parts are removed by naming the types you do want rather than by filtering them out directly; and the part type that versions below 2.6 return as `note_and_reopen` is named `note_and_unsnooze` here. Up to 50 values are accepted, and `include_part_types` cannot be combined with `exclude_part_types`; both cases return a 422. Supply one comma-separated value; repeating the parameter is not read as a combined list, and only the last occurrence is used. The filter is applied before the conversation parts limit, so the newest matching parts are returned. Available on the Preview version; a 422 is returned on any other version.
+        description: A comma-separated list of conversation part types to leave out, such as `assignment`, `note` or `snoozed`. Cannot be combined with `include_part_types`.
         example: assignment
         schema:
           type: array
@@ -13302,7 +13302,7 @@ paths:
                     request_id: 1f2e3d4c-5b6a-4798-8c9d-0e1f2a3b4c5d
                     errors:
                     - code: parameter_invalid
-                      message: 'Unknown conversation part types: coment'
+                      message: 'Unknown conversation part types: foo'
                 Filtering on the unknown part type:
                   value:
                     type: error.list