fixed misspelling of apprear to appear (#17735)

CONTRIBUTING.md

@@ -1341,7 +1341,7 @@ Chart parameters are stored as a JSON encoded string the `slices.params` column
 
 The following tables provide a non-exhausive list of the various fields which can be present in the JSON object grouped by the Explorer pane sections. These values were obtained by extracting the distinct fields from a legacy deployment consisting of tens of thousands of charts and thus some fields may be missing whilst others may be deprecated.
 
-Note not all fields are correctly categorized. The fields vary based on visualization type and may apprear in different sections depending on the type. Verified deprecated columns may indicate a missing migration and/or prior migrations which were unsuccessful and thus future work may be required to clean up the form-data.
+Note not all fields are correctly categorized. The fields vary based on visualization type and may appear in different sections depending on the type. Verified deprecated columns may indicate a missing migration and/or prior migrations which were unsuccessful and thus future work may be required to clean up the form-data.
 
 ### Datasource & Chart Type