Update client installation docs

Author: deliahu

docs/clients/install.md

@@ -31,4 +31,6 @@ $ bash -c "$(curl -sS https://raw.githubusercontent.com/cortexlabs/cortex/v0.26.
 
 By default, the Cortex CLI is installed at `/usr/local/bin/cortex`. To install the executable elsewhere, export the `CORTEX_INSTALL_PATH` environment variable to your desired location before running the command above.
 
-By default, the Cortex CLI creates a directory at `~/.cortex/` and uses it to store environment configuration. To use a different directory, export the `CORTEX_CLI_CONFIG_DIR` environment variable before running a `cortex` command.
+## Changing the CLI/client configuration directory
+
+By default, the Cortex CLI/client creates a directory at `~/.cortex/` and uses it to store environment configuration. To use a different directory, export the `CORTEX_CLI_CONFIG_DIR` environment variable before running any `cortex` commands.