Update some help examples (#8759)

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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/debug/explain.rs

@@ -51,7 +51,7 @@ impl Command for Explain {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Explain a command within a closure",
-            example: "explain { ls | sort-by name type -i | get name } | table -e",
+            example: "explain {|| ls | sort-by name type -i | get name } | table -e",
             result: None,
         }]
     }