Fix typo

Author: lpil

CHANGELOG.md

@@ -11,3 +11,7 @@
 ### Formatter
 
 ### Bug fixes
+
+- Fixed a typo in the error message emitted when trying to run a module that
+  does not have a main function.
+  ([Louis Pilfold](https://github.com/lpil))

CONTRIBUTING.md

@@ -101,7 +101,7 @@ rustup upgrade stable
 
 The compiler uses a Cap'n Proto schema to serialize/deserialize module information.
 Occasionally, the schema needs to change. After modifying `compiler-core/schema.capnp`
-you need to to re-generate `compiler-core/generated/schema_capnp.rs`. To do that,
+you need to re-generate `compiler-core/generated/schema_capnp.rs`. To do that,
 [install Cap'n Proto](https://capnproto.org/install.html) and un-comment appropriate lines
 in `compiler-core/build.rs`. Then you should be able to re-generate that file with:
 

compiler-core/src/error.rs

@@ -922,8 +922,7 @@ forward slash and must not end with a slash."
                 level: Level::Error,
                 location: None,
                 hint: Some(format!(
-                    "Add a public `main` function to \
-to `{}/{module}.gleam`.",
+                    "Add a public `main` function to `{}/{module}.gleam`.",
                     origin.folder_name()
                 )),
             }],