improve bash and zsh

Applications/Essential/Zsh.md

@@ -1,10 +1,6 @@
 # [Zsh](https://wiki.archlinux.org/index.php/Zsh)
 
-Set default shell:
-
-```sh
-chsh -s /usr/local/bin/zsh
-```
+## macOS
 
 To use latest zsh in macOS, install `zsh` with Homebrew.
 Then append to `/etc/shells`:
@@ -12,3 +8,9 @@ Then append to `/etc/shells`:
 ```txt
 /usr/local/bin/zsh
 ```
+
+Set default shell:
+
+```sh
+chsh -s /usr/local/bin/zsh
+```

Development/Bash/README.md

@@ -1,4 +1,4 @@
-# Bash
+# [Bash](https://wiki.archlinux.org/index.php/bash)
 
 Add to `~/.bashrc`:
 
@@ -30,8 +30,7 @@ Shebang:
 In macOS, Bash read `~/.bash_profile` not `~/.bashrc`, so edit `~/.bash_profile`:
 
 ```bash
-[[ -f ~/.bashrc ]] && \
-    source ~/.bashrc
+[[ -f ~/.bashrc ]] && source ~/.bashrc
 ```
 
 To use latest Bash, install `bash` with Homebrew.
@@ -43,6 +42,6 @@ Then append to `/etc/shells`:
 
 Set default shell
 
-```
+```sh
 chsh -s /usr/local/bin/bash
 ```