Please address the comments from this code review:

## Overall Comments
- In `set_path_for_multishell`, the `unsafe` block around `std::env::set_var` is unnecessary since `set_var` is safe; you can drop the `unsafe` entirely.
- When prepending `multishell_path` to `PATH` in `set_path_for_multishell`, consider de-duplicating the entry so repeated `fnm env --use-on-cd` calls don’t keep growing `PATH` with identical prefixes.

## Individual Comments

### Comment 1
<location path="CHANGELOG.md" line_range="13" />
<code_context>
+
+### Patch Changes
+
+- [#1268](https://github.com/Schniz/fnm/pull/1268) [`ddab191`](https://github.com/Schniz/fnm/commit/ddab1911dc33a24aeec9d2b8139df1916c518d64) Thanks [@isaacl](https://github.com/isaacl)! - Make `fnm default` with no trailing positional argument to return the default version
+
+- [#1517](https://github.com/Schniz/fnm/pull/1517) [`d3747af`](https://github.com/Schniz/fnm/commit/d3747affd604223c752171c14944bd5773096b09) Thanks [@Schniz](https://github.com/Schniz)! - Improve `--use-on-cd` shell hook robustness by de-duplicating the zsh hook on re-source and fixing Windows CMD hook behavior for paths with spaces and drive changes.
</code_context>
<issue_to_address>
**nitpick (typo):** Tighten grammar in the `fnm default` description.

The phrase "Make `fnm default` with no trailing positional argument to return the default version" is a bit awkward. Consider wording it as "Make `fnm default` with no trailing positional argument return the default version" or "Have `fnm default` with no trailing positional argument return the default version."

```suggestion
- [#1268](https://github.com/Schniz/fnm/pull/1268) [`ddab191`](https://github.com/Schniz/fnm/commit/ddab1911dc33a24aeec9d2b8139df1916c518d64) Thanks [@isaacl](https://github.com/isaacl)! - Have `fnm default` with no trailing positional argument return the default version
```
</issue_to_address>

### Comment 2
<location path="docs/commands.md" line_range="383" />
<code_context>
 This command generates a series of shell commands that should be evaluated by your shell to create a fnm-ready environment.

-Each shell has its own syntax of evaluating a dynamic expression. For example, evaluating fnm on Bash and Zsh would look like `eval "$(fnm env)"`. In Fish, evaluating would look like `fnm env | source`
+Each shell has its own syntax of evaluating a dynamic expression. For example, evaluating fnm on Bash and Zsh would look like `eval "$(fnm env --shell bash)"`. In Fish, evaluating would look like `fnm env --shell fish | source`

 Usage: fnm env [OPTIONS]
</code_context>
<issue_to_address>
**nitpick (typo):** Add terminal punctuation to the modified sentence for consistency.

The sentence ending with `fnm env --shell fish | source` is the only one in the paragraph without a period. Please add a period for consistency.

```suggestion
Each shell has its own syntax of evaluating a dynamic expression. For example, evaluating fnm on Bash and Zsh would look like `eval "$(fnm env --shell bash)"`. In Fish, evaluating would look like `fnm env --shell fish | source`.
```
</issue_to_address>