docs:fix spelling issues (#1699)

* Update CHANGELOG.md

* Update mod.rs

* Update runtime_apis.rs

* Update setup_client_custom_rpc.rs

* Update subxt/examples/setup_client_custom_rpc.rs

Co-authored-by: James Wilson <james@jsdw.me>

* Update subxt/examples/setup_client_custom_rpc.rs

Co-authored-by: James Wilson <james@jsdw.me>

---------

Co-authored-by: James Wilson <james@jsdw.me>

codegen/src/api/mod.rs

@@ -262,7 +262,7 @@ impl RuntimeGenerator {
                 /// The outer extrinsic enum.
                 pub type Call = #call_path;
 
-                /// The outer error enum representing the DispatchError's Module variant.
+                /// The outer error enum represents the DispatchError's Module variant.
                 pub type Error = #error_path;
 
                 pub fn constants() -> ConstantsApi {

codegen/src/api/runtime_apis.rs

@@ -22,7 +22,7 @@ fn generate_runtime_api(
     type_gen: &TypeGenerator,
     crate_path: &syn::Path,
 ) -> Result<(TokenStream2, TokenStream2), CodegenError> {
-    // Trait name must remain as is (upper case) to identity the runtime call.
+    // Trait name must remain as is (upper case) to identify the runtime call.
     let trait_name_str = api.name();
     // The snake case for the trait name.
     let trait_name_snake = format_ident!("{}", api.name().to_snake_case());