fix brew command to install clang

Author: jasonrandrews

content/learning-paths/cross-platform/multiplying-matrices-with-sme2/1-get-started.md

@@ -96,7 +96,7 @@ Install Clang using the instructions below, selecting either macOS or Linux/Ubun
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   {{< tab header="macOS" language="bash">}}
-  brew install clang
+  brew install llvm
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