rbash: convert to an alias, bash: add option placeholder

pages/common/bash.md

@@ -34,4 +34,4 @@
 
 - Start a [r]estricted shell session:
 
-`bash -r`
+`bash {{[-r|--restricted]}}`

pages/common/rbash.md

@@ -1,30 +1,7 @@
 # rbash
 
-> Restricted Bash shell, equivalent to `bash --restricted`.
-> Does not permit changing the working directory, redirecting command output, or modifying environment variables, among other things.
-> See also: `!` and `^` for history expansion.
-> More information: <https://www.gnu.org/software/bash/manual/bash.html#The-Restricted-Shell>.
+> This command is an alias of `bash --restricted`.
 
-- Start an interactive shell session:
+- View documentation for the original command:
 
-`rbash`
-
-- Execute a command and then exit:
-
-`rbash -c "{{command}}"`
-
-- Execute a script:
-
-`rbash {{path/to/script.sh}}`
-
-- Execute a script, printing each command before executing it:
-
-`rbash -x {{path/to/script.sh}}`
-
-- Execute commands from a script, stopping at the first error:
-
-`rbash -e {{path/to/script.sh}}`
-
-- Read and execute commands from `stdin`:
-
-`rbash -s`
+`tldr bash`