update canoe/readme (#5014)

fix command, pyusb is installed with pip, not brew. remove extra ` in command

keyboards/canoe/readme.md

@@ -34,8 +34,8 @@ macOS:
 3. Install the following packages:
     ```
     brew install python
-    brew install pyusb
-    brew install --HEAD`https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+    pip install pyusb
+    brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
 
 4. Place your keyboard into reset. 
 5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file.