chore(topic): add `help` example (#8514)

* Update command-help.md

Feat: Adding the --help flag explanation

* Update src/data/roadmaps/linux/content/shell-basics/command-help.md

* Update command-help.md

---------

Co-authored-by: Arik Chakma <arikchangma@gmail.com>

src/data/roadmaps/linux/content/shell-basics/command-help.md

@@ -14,6 +14,12 @@ For built-in shell functions, use:
 help [command]
 ```
 
+Moreover, you can add the *--help* flag to almost any command to get more information about it.
+For example:
+```bash
+date --help
+```
+
 To view examples with TLDR, use:
 
 ```bash
@@ -24,4 +30,4 @@ Learn more from the following resources:
 
 - [@article@How to use the man page](https://www.baeldung.com/linux/man-command)
 - [@opensource@tldr-pages/tldr](https://github.com/tldr-pages/tldr)
-- [@article@Get Help on Linux Commands](https://labex.io/tutorials/linux-get-help-on-linux-commands-18000)
+- [@article@Get Help on Linux Commands](https://labex.io/tutorials/linux-get-help-on-linux-commands-18000)