Base: Update Assistant & Tips-and-Tricks manpages

Update the Assistant manpage with instructions on how to run a command
in Terminal. Reflect this to the Assistant section in Tips-and-Tricks.
Also add instructions for launching applications with arguments.

Base/usr/share/man/man1/Applications/Assistant.md

@@ -16,5 +16,7 @@ $ Assistant
 
 ### Features
 
-* Enter a URL to open it in the web browser.
-* Do quick calculations by typing the equal sign (=) followed by a mathematical expression, e.g. `=22*101`. Press Return to copy the result.
+* Enter a URL to open it in the web browser, e.g. `serenityos.org`.
+* Perform quick calculations by typing the equal sign (=) followed by a mathematical expression, e.g. `=22*101`. Press Return to copy the result.
+* Run commands in [Terminal](help://man/1/Applications/Terminal) by prefixing them with a dollar sign ($), e.g. `$ uname -a`.
+* Launch applications with arguments, e.g. launch Pixel Paint with a file: `pp image.png`.

Base/usr/share/man/man7/Tips-and-Tricks.md

@@ -29,8 +29,9 @@ This is a list of useful tips and tricks to help you make the most out of Sereni
 
 ### [Assistant](help://man/1/Applications/Assistant)
 * Assistant can help you to quickly find files and launch applications. Open it with `Super+Space`.
-* Enter a URL to open it in the web browser.
-* Do quick calculations by typing the equal sign (=) followed by a mathematical expression, e.g. `=22*101`. Press Return to copy the result.
+* Enter a URL to open it in the web browser, e.g. `serenityos.org`.
+* Perform quick calculations by typing the equal sign (=) followed by a mathematical expression, e.g. `=22*101`. Press Return to copy the result.
+* Run commands in the terminal by prefixing them with a dollar sign ($), e.g. `$ uname -a`.
 
 ### [Browser](help://man/1/Applications/Browser)
 * Browser has built-in content filtering, which can be used for ad blocking. Update the filters in `~/.config/BrowserContentFiltering.txt`.