Fix "rusftmt" typos

Author: cuviper

Diff for: Configurations.md

@@ -15,7 +15,7 @@ To enable unstable options, set `unstable_features = true` in `rustfmt.toml` or
 
 ## Configuration file resolution
 
-As mentioned above, rusftmt searches for a `rustfmt.toml` or `.rustfmt.toml` in the directory it is
+As mentioned above, rustfmt searches for a `rustfmt.toml` or `.rustfmt.toml` in the directory it is
 run and all parent directories.
 
 If none of these directories contain such a file, both your home directory and a directory called `rustfmt` in your [global config directory](https://docs.rs/dirs/1.0.4/dirs/fn.config_dir.html) (e.g. `.config/rustfmt/`) are checked as well.
@@ -34,22 +34,22 @@ outer
     |-- lib_inner.rs
 ```
 
-Where `outer/rusftmt.toml` is
+Where `outer/rustfmt.toml` is
 
 ```toml
 max_width = 80
 array_width = 50
 ignore = ['inner/inner.rs']
 ```
 
-and `outer/inner/rusftmt.toml` is
+and `outer/inner/rustfmt.toml` is
 
 ```toml
 max_width = 70
 ignore = ['./lib_inner.rs']
 ```
 
-If run in the `inner` directory, rusftmt's internal configuration will include
+If run in the `inner` directory, rustfmt's internal configuration will include
 
 ```toml
 max_width = 70