fix highlighting, misc improvements

examples/BasicDict/README.md

@@ -29,7 +29,7 @@ The type of the key must implement the `Hash` and `Eq` abilities.
 Nearly all Roc builtin types (`Str`, `Bool`, `List`, `Int *`,...) implement these.
 
 If you are defining an [opaque type](https://www.roc-lang.org/tutorial#opaque-types), adding `implements [Hash, Eq]` is all you need to be able to use it as a key:
-```
+```roc
 Username := Str implements [Hash, Eq]
 ```
 

examples/DotNetPlatform/README.md

@@ -10,17 +10,17 @@ file:main.roc
 ```
 
 platform/main.roc:
-```
+```roc
 file:platform/main.roc
 ```
 
 platform/DotNetRocPlatform.csproj:
-```
+```xml
 file:platform/DotNetRocPlatform.csproj
 ```
 
 platform/Program.cs:
-```
+```csharp
 file:platform/Program.cs
 ```
 
@@ -29,17 +29,17 @@ file:platform/Program.cs
 1. Build the roc app that is using the dotnet platform:
 
 ```cli
-cd examples/DotNetPlatform/
-roc build main.roc --lib --output ./platform/interop
+$ cd examples/DotNetPlatform/
+$ roc build main.roc --lib --output ./platform/interop
 ```
 > _use `arch -arm64` if you are running in a Apple Silicon mac._
 
 This will produce a shared library file that we'll be able to import from a .NET context.
 
 To run:
 ```cli
-cd platform
-dotnet run
+$ cd platform
+$ dotnet run
 ```
 This should print "Hello from .NET".
 
@@ -50,11 +50,11 @@ If you want to build a binary for the app using native AOT:
 
 1. Publish the dotnet app
 ```cli
-dotnet publish -c Release
+$ dotnet publish -c Release
 ```
 > _use `arch -arm64` if you are running in a Apple Silicon mac._
 
 2. `cd` into the into the `publish` folder and run the binary:
 ```cli
-./DotNetRocPlatform
+$ ./DotNetRocPlatform
 ```

examples/GoPlatform/README.md

@@ -10,7 +10,7 @@ file:main.roc
 ```
 
 platform/main.roc:
-```
+```roc
 file:platform/main.roc
 ```
 
@@ -25,7 +25,7 @@ file:platform/main.go
 ```
 
 platform/host.h:
-```
+```c
 file:platform/host.h
 ```
 
@@ -38,9 +38,9 @@ For now, the compiled Roc binary and the go binary have to be manualy [linked](h
 Build steps:
 
 ```bash
-cd examples/GoPlatform
-roc build --no-link main.roc
-go build platform/main.go
+$ cd examples/GoPlatform
+$ roc build --no-link main.roc
+$ go build platform/main.go
 ```
 
 Run the produced executable with `./main`.

examples/IngestFiles/README.md

@@ -1,6 +1,6 @@
 # Ingest Files
 
-Statically importing files as a `Str` or a `List U8`.
+Statically importing files as a `Str` or a `List U8`:
 
 ```roc
 imports [