Decrease Generate Suggestion Debounce Delay to 500ms

To have smoother experience.

I checked data and we can query more often.

Release-Notes: skip
Google-Bug-Id: b/330832131
Change-Id: I8b01df9220b7e00f26b127447bdc60a1db20b423

polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index 9ac1879..16a783c 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -90,7 +90,7 @@
 
 // visible for testing
 export const AUTO_SAVE_DEBOUNCE_DELAY_MS = 2000;
-export const GENERATE_SUGGESTION_DEBOUNCE_DELAY_MS = 1500;
+export const GENERATE_SUGGESTION_DEBOUNCE_DELAY_MS = 500;
 export const ENABLE_GENERATE_SUGGESTION_STORAGE_KEY =
   'enableGenerateSuggestionStorageKeyForCommentWithId-';