Auto merge of #21460 - atouchet:shortcuts, r=paulrouget

List additional keyboard shortcuts

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/21460)
<!-- Reviewable:end -->

README.md

@@ -283,11 +283,13 @@ Run Servo with the command:
 
 ### Keyboard Shortcuts
 
-- `Ctrl`+`-` zooms out
-- `Ctrl`+`=` zooms in
+- `Ctrl`+`L` opens URL prompt (`Cmd`+`L` on Mac)
+- `Ctrl`+`R` reloads current page (`Cmd`+`R` on Mac)
+- `Ctrl`+`-` zooms out (`Cmd`+`-` on Mac)
+- `Ctrl`+`=` zooms in (`Cmd`+`=` on Mac)
 - `Alt`+`left arrow` goes backwards in the history (`Cmd`+`left arrow` on Mac)
 - `Alt`+`right arrow` goes forwards in the history (`Cmd`+`right arrow` on Mac)
-- `Esc` exits servo
+- `Esc` or `Ctrl`+`Q` exits Servo (`Cmd`+`Q` on Mac)
 
 ## Developing