whiptail, gum, dialog: fix style guide issues and refer to each other (#17955)

pages/common/gum.md

@@ -1,6 +1,7 @@
 # gum
 
 > Make glamorous shell scripts.
+> See also: `whiptail`, `dialog`.
 > More information: <https://github.com/charmbracelet/gum>.
 
 - Interactively pick a specific option to print to `stdout`:
@@ -17,11 +18,11 @@
 
 - Show a spinner while a command is taking place with text alongside:
 
-`gum spin --spinner {{dot|line|minidot|jump|pulse|points|globe|moon|monkey|meter|hamburger}} --title "{{loading...}}" -- {{command}}`
+`gum spin {{[-s|--spinner]}} {{dot|line|minidot|jump|pulse|points|globe|moon|monkey|meter|hamburger}} --title "{{loading...}}" -- {{command}}`
 
 - Format text to include emojis:
 
-`gum format -t {{emoji}} "{{:smile: :heart: hello}}"`
+`gum format {{[-t|--type]}} {{emoji}} "{{:smile: :heart: hello}}"`
 
 - Interactively prompt for multi-line text (`<Ctrl d>` to save) and write to `data.txt`:
 

pages/linux/dialog.md

@@ -1,6 +1,7 @@
 # dialog
 
 > Display dialog boxes on the terminal.
+> See also: `gum`, `whiptail`.
 > More information: <https://manned.org/dialog>.
 
 - Display a message:

pages/linux/whiptail.md

@@ -1,6 +1,7 @@
 # whiptail
 
 > Display text-based dialog boxes from shell scripts.
+> See also: `dialog`, `gum`.
 > More information: <https://manned.org/whiptail>.
 
 - Display a simple message:
@@ -25,4 +26,4 @@
 
 - Display a multiple-choice menu:
 
-`{{result_variable_name}}=$(whiptail --title "{{title}}" --menu "{{message}}" {{height_in_chars}} {{width_in_chars}} {{menu_display_height}} "{{value_1}}" "{{display_text_1}}" "{{value_n}}" "{{display_text_n}}" ..... 3>&1 1>&2 2>&3)`
+`{{result_variable_name}}=$(whiptail --title "{{title}}" --menu "{{message}}" {{height_in_chars}} {{width_in_chars}} {{menu_display_height}} {{"value_1" "display_text_1" "value_2" "display_text_2" ...}} 3>&1 1>&2 2>&3)`