docs: use csharp generate language

Author: rain

docs/docs/00200-core-concepts/00600-clients/00200-codegen.md

@@ -45,7 +45,7 @@ Replace **PATH-TO-MODULE-DIRECTORY** with the path to your module's directory, w
 
 ```bash
 mkdir -p module_bindings
-spacetime generate --lang cs --out-dir module_bindings --module-path PATH-TO-MODULE-DIRECTORY
+spacetime generate --lang csharp --out-dir module_bindings --module-path PATH-TO-MODULE-DIRECTORY
 ```
 
 This generates C# files in `module_bindings/`. The generated files are automatically included in your project.

docs/docs/00200-core-concepts/00600-clients/00600-csharp-reference.md

@@ -73,7 +73,7 @@ Each SpacetimeDB client depends on some bindings specific to your module. Create
 
 ```bash
 mkdir -p module_bindings
-spacetime generate --lang cs --out-dir module_bindings --module-path PATH-TO-MODULE-DIRECTORY
+spacetime generate --lang csharp --out-dir module_bindings --module-path PATH-TO-MODULE-DIRECTORY
 ```
 
 Replace `PATH-TO-MODULE-DIRECTORY` with the path to your SpacetimeDB module.