Fix typo in extract-documents-content description (#17627)

Co-authored-by: Yunbao <66679512+NewFlocon@users.noreply.github.com>

cmd/mattermost/commands/extract_content.go

@@ -16,7 +16,7 @@ import (
 var ExtractContentCmd = &cobra.Command{
 	Use:     "extract-documents-content",
 	Short:   "Extracts the documents content",
-	Long:    "Extracts the documents content and stores it in the database for document searche",
+	Long:    "Extracts the documents content and stores it in the database for document search",
 	Example: "extract-documents-content --from=12345",
 	RunE:    extractContentCmdF,
 }