Update trim_.rs (#8201)

fix typo in help messages


# Description

_(Thank you for improving Nushell. Please, check our [contributing
guide](../CONTRIBUTING.md) and talk to the core team before making major
changes.)_

_(Description of your pull request goes here. **Provide examples and/or
screenshots** if your changes affect the user experience.)_

# User-Facing Changes

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

---------

Co-authored-by: Reilly Wood <reilly.wood@icloud.com>

crates/nu-command/src/strings/str_/trim/trim_.rs

@@ -39,12 +39,13 @@ impl Command for SubCommand {
 
     fn signature(&self) -> Signature {
         Signature::build("str trim")
-        .input_output_types(vec![(Type::String, Type::String)])
-        .vectorizes_over_list(true)
-        .rest(
+            .input_output_types(vec![(Type::String, Type::String)])
+            .vectorizes_over_list(true)
+            .rest(
                 "rest",
                 SyntaxShape::CellPath,
-                "For a data structure input, trim strings at the given cell paths",            )
+                "For a data structure input, trim strings at the given cell paths",
+            )
             .named(
                 "char",
                 SyntaxShape::String,
@@ -53,21 +54,29 @@ impl Command for SubCommand {
             )
             .switch(
                 "left",
-                "trims characters only from the beginning of the string (default: whitespace)",
+                "trims characters only from the beginning of the string",
                 Some('l'),
             )
             .switch(
                 "right",
-                "trims characters only from the end of the string (default: whitespace)",
+                "trims characters only from the end of the string",
                 Some('r'),
             )
             .switch(
                 "all",
-                "trims all characters from both sides of the string *and* in the middle (default: whitespace)",
+                "trims all characters from both sides of the string *and* in the middle",
                 Some('a'),
             )
-            .switch("both", "trims all characters from left and right side of the string (default: whitespace)", Some('b'))
-            .switch("format", "trims spaces replacing multiple characters with singles in the middle (default: whitespace)", Some('f'))
+            .switch(
+                "both",
+                "trims all characters from left and right side of the string",
+                Some('b'),
+            )
+            .switch(
+                "format",
+                "trims spaces replacing multiple characters with singles in the middle",
+                Some('f'),
+            )
     }
     fn usage(&self) -> &str {
         "Trim whitespace or specific character"