Improve Homebrew README (#1084)

Author: Oliver Weiler

src/jreleaser/distributions/sdkman-cli/brew/README.md.tpl

@@ -6,13 +6,13 @@ A Homebrew tap containing the Formula for the SDKMAN! CLI.
 
 ```sh
 $ brew tap sdkman/tap
-$ brew install sdkman
+$ brew install sdkman-cli
 ```
 
 After successful installation add the following lines to the end of your `.bash_profile`
 
 ```sh
-export SDKMAN_DIR=$(brew --prefix sdkman)/libexec
+export SDKMAN_DIR=$(brew --prefix sdkman-cli)/libexec
 [[ -s "${SDKMAN_DIR}/bin/sdkman-init.sh" ]] && source "${SDKMAN_DIR}/bin/sdkman-init.sh"
 ```