pages*: mark keys according to the guideline (#11907)

pages/common/bastet.md

@@ -9,7 +9,7 @@
 
 - Navigate the piece horizontally:
 
-`{{Left|Right}} arrow key`
+`{{Left|Right arrow key}}`
 
 - Rotate the piece clockwise or counterclockwise:
 
@@ -17,11 +17,11 @@
 
 - Soft drop the piece:
 
-`Down arrow key`
+`{{Down arrow key}}`
 
 - Hard drop the piece:
 
-`Enter`
+`<Enter>`
 
 - Pause the game:
 
@@ -29,4 +29,4 @@
 
 - Quit the game:
 
-`Ctrl + C`
+`<Ctrl> + C`