Update some help examples (#8759)

# Description

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Recently a few things changed, which now create issues:
- `1.0.0`, `+500`, and `0x000000` used to get parsed as string, but now
just errors
- `each { print $in }` -> `each {|| print $in }`

I looked through all the help pages and fixed every highlighted (red
background) error: `help commands | each {|i| help $i.name} | table |
less`

# User-Facing Changes

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The examples work again and no longer contain error syntax-highlighting

# Tests + Formatting

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crates/nu-command/src/platform/ansi/gradient.rs

@@ -72,25 +72,25 @@ impl Command for SubCommand {
             Example {
             description: "draw text in a gradient with foreground start and end colors",
             example:
-                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart 0x40c9ff --fgend 0xe81cff",
+                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart '0x40c9ff' --fgend '0xe81cff'",
             result: None,
         },
         Example {
             description: "draw text in a gradient with foreground start and end colors and background start and end colors",
             example:
-                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart 0x40c9ff --fgend 0xe81cff --bgstart 0xe81cff --bgend 0x40c9ff",
+                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart '0x40c9ff' --fgend '0xe81cff' --bgstart '0xe81cff' --bgend '0x40c9ff'",
             result: None,
         },
         Example {
             description: "draw text in a gradient by specifying foreground start color - end color is assumed to be black",
             example:
-                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart 0x40c9ff",
+                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgstart '0x40c9ff'",
             result: None,
         },
         Example {
             description: "draw text in a gradient by specifying foreground end color - start color is assumed to be black",
             example:
-                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgend 0xe81cff",
+                "'Hello, Nushell! This is a gradient.' | ansi gradient --fgend '0xe81cff'",
             result: None,
         },
         ]