chore: update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 
-<!-- Your issue may already be reported!  Please search on the [issue tracker](https://github.com/sigoden/aichat/issues) before creating one. -->
+<!-- Your issue may already be reported!  Please search for it before creating one. -->
 
 **Describe the bug**
 A clear and concise description of what the bug is. 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 
-<!-- Your issue may already be reported! Please search on the [issue tracker](https://github.com/sigoden/aichat/issues) before creating one. -->
+<!-- Your issue may already be reported! Please search for it before creating one. -->
 
 If you are requesting support for the new model, goto [model-request](https://github.com/sigoden/aichat/issues/new?assignees=&labels=enhancement&projects=&template=model_request.md&title=).
 

.github/ISSUE_TEMPLATE/model_request.md

@@ -13,7 +13,7 @@ assignees: ''
 - [ ] Must be publicly accessible. It cannot require application review or have regional restrictions. A beta version is acceptable.
 - [ ] Must not act as an agent or proxy for other platforms.
 
-> Tip: If the API is compatible with OpenAI's API, it can be used through `openai-compatible` client.
+> Tip: If the API is compatible with OpenAI's API, you can access it using the `openai-compatible` client.
 
 ### Please provide the following documents or links: