Tidy up issue templates (#3511)

.github/ISSUE_TEMPLATE/bug.yml

@@ -1,12 +1,12 @@
 name: 🐞 Compiler Bug Report
-description: For bugs of the Typst compiler
+description: For bugs in the Typst compiler
 title: Write a short and descriptive title!
 labels:
   - bug
 body:
   - type: markdown
     attributes:
-      value: Thanks for reporting a bug on the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+-label%3A%22web+app%22) if your issue has already been filed? If so, join the discussion there! Is your issue related to Typst's web app? Please file it [here](https://github.com/typst/webapp-issues/issues) instead.
+      value: Thanks for reporting a bug in the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+-label%3A%22web+app%22) if your issue has already been filed? If so, join the discussion there! Is your issue related to Typst's web app? Please file it [here](https://github.com/typst/webapp-issues/issues) instead.
   - type: textarea
     id: description
     attributes:
@@ -19,7 +19,7 @@ body:
     id: repro-url
     attributes:
       label: Reproduction URL
-      description: If your did not specify Typst code above, you can share a link to your typst.app project here
+      description: If you did not specify Typst code above, you can share a link to your typst.app project here
       placeholder: https://typst.app/project/rU6j4Q5foiCcvB7Hz_gs9m
     validations:
       required: false

.github/ISSUE_TEMPLATE/feature.yml

@@ -1,5 +1,5 @@
 name: 🪴 Compiler Feature Request
-description: For feature request for the Typst compiler
+description: For feature requests for the Typst compiler
 title: Write a short and descriptive title!
 labels:
   - feature request