docs(NODE-3509): Update error documentation

docs/charts/README.md

@@ -4,4 +4,8 @@ The `mermaid` directory contains the [mermaid](https://mermaid-js.github.io/merm
 
 To generate these files, there is an included script, `build_images.sh` which builds images for all the mermaid files in the `mermaid` directory.
 
-To use this script, the [mermaid cli](https://github.com/mermaid-js/mermaid-cli) must be installed and be accessible via your $PATH variable. 
+To use this script, the [mermaid cli](https://github.com/mermaid-js/mermaid-cli) must be installed and be accessible via your $PATH variable.
+
+**Note on mermaid installation**
+
+It is preferable to install mermaid via npm rather than brew since brew will install node as a dependency which could interfere with nvm.