Enforce required, optional, and rest positional arguments start with an uppercase and end with a period. (#11285)

# Description

This updates all the positional arguments (except with
`--features=dataframe` or `--features=extra`) to start with an uppercase
letter and end with a period.

Part of #5066, specifically [this
comment](/nushell/nushell/issues/5066#issuecomment-1421528910)

Some arguments had example data removed from them because it also
appears in the examples.

There are other inconsistencies in positional arguments I noticed while
making the tests pass which I will bring up in #5066.

# User-Facing Changes

Positional arguments are now consistent

# Tests + Formatting

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting

Automatic documentation updates

crates/nu-command/src/bytes/at.rs

@@ -47,11 +47,11 @@ impl Command for BytesAt {
                 (Type::Table(vec![]), Type::Table(vec![])),
                 (Type::Record(vec![]), Type::Record(vec![])),
             ])
-            .required("range", SyntaxShape::Range, "the range to get bytes")
+            .required("range", SyntaxShape::Range, "The range to get bytes.")
             .rest(
                 "rest",
                 SyntaxShape::CellPath,
-                "for a data structure input, get bytes from data at the given cell paths",
+                "For a data structure input, get bytes from data at the given cell paths.",
             )
             .category(Category::Bytes)
     }