Update 1_prerequisites.md (#2193)

Outdated homebrew command
CMU-Perceptual-Computing-Lab · Apr 22, 2023 · 5e57c2d · 5e57c2d
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diff --git a/doc/installation/1_prerequisites.md b/doc/installation/1_prerequisites.md
@@ -76,7 +76,7 @@ sudo pip install numpy opencv-python
 
 ## Mac OS Prerequisites
 1. If you don't have `brew`, install it by running `bash scripts/osx/install_brew.sh` on your terminal.
-2. Install **CMake GUI**: Run the command `brew cask install cmake`.
+2. Install **CMake GUI**: Run the command `brew install --cask cmake`.
 3. Install **Caffe, OpenCV, and Caffe prerequisites**: Run `bash scripts/osx/install_deps.sh`.