irb: add examples (#23589)

* irb: add examples

* irb: remove redundant description

pages/common/irb.md

@@ -1,9 +1,28 @@
 # irb
 
 > Interactive Ruby shell.
-> Evaluate Ruby code read from `stdin`.
 > More information: <https://ruby.github.io/irb/>.
 
 - Start the interactive shell:
 
 `irb`
+
+- Start the interactive shell with the simple prompt:
+
+`irb --simple-prompt`
+
+- Start the interactive shell without reading the configuration file:
+
+`irb -f`
+
+- Evaluate Ruby code read from `stdin`:
+
+`echo "{{puts 'Hello world'}}" | irb --noecho`
+
+- Display help:
+
+`irb {{[-h|--help]}}`
+
+- Display version:
+
+`irb {{[-v|--version]}}`