Fix links in tutorial files (#6393)

Author: echeran

tutorials/README.md

@@ -50,7 +50,7 @@ icu = { version = "2.0.0-dev", features = ["serde"] }
 icu_provider_blob = {version = "2.0.0-dev", features = ["alloc"] }
 ```
 
-To learn about building ICU4X data, including whether to check in the data blob file to your repository, see [data_management.md](./data_management.md).
+To learn about building ICU4X data, including whether to check in the data blob file to your repository, see [data-management.md](./data-management.md).
 
 [« Fully Working Example »](./crates/buffer)
 

tutorials/cargo.md

@@ -153,7 +153,7 @@ The way `ICU4X` handles data is one of its novelties, aimed at making the data m
 
 `ICU4X` by default contains data for a a wide range of CLDR locales[^1], meaning that for most languages, the constructors can be considered infallible and you can `expect` or `unwrap` them, as we did above.
 
-However, shipping the library with all locales will have a size impact on your binary. It also requires you to update your binary whenever CLDR data changes, which happens twice a year. To learn how to solve these problems, see our [data management](data_management.md) tutorial.
+However, shipping the library with all locales will have a size impact on your binary. It also requires you to update your binary whenever CLDR data changes, which happens twice a year. To learn how to solve these problems, see our [data management](data-management.md) tutorial.
 
 [^1]: All locales with coverage level `basic`, `moderate`, or `modern` in [`CLDR`](https://github.com/unicode-org/cldr-json/blob/main/cldr-json/cldr-core/coverageLevels.json)
 
@@ -163,7 +163,7 @@ This concludes this introduction tutorial. With the help of `DateTimeFormat`, `L
 
 Internationalization is a broad domain and there are many more components in `ICU4X`.
 
-Next, learn how to [generate optimized data for your binary](data_management.md), [configure your Cargo.toml file](cargo.md), or continue exploring by reading [the docs](https://docs.rs/icu/latest/).
+Next, learn how to [generate optimized data for your binary](data-management.md), [configure your Cargo.toml file](cargo.md), or continue exploring by reading [the docs](https://docs.rs/icu/latest/).