docs: fix typos (#1776)

* Update mod.rs

* Update extrinsics.rs

* Update address.rs

* Update codegen/src/api/mod.rs

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

---------

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

codegen/src/api/mod.rs

@@ -253,7 +253,7 @@ impl RuntimeGenerator {
                 // Runtime APIs in the metadata by name.
                 pub static RUNTIME_APIS: [&str; #runtime_api_names_len] = [ #(#runtime_api_names,)* ];
 
-                /// The error type returned when there is a runtime issue.
+                /// The error type that is returned when there is a runtime issue.
                 pub type DispatchError = #types_mod_ident::sp_runtime::DispatchError;
 
                 /// The outer event enum.

core/src/blocks/extrinsics.rs

@@ -691,7 +691,7 @@ mod tests {
             .expect("Valid dynamic parameters are provided");
 
         // Note: `create_unsigned` produces the extrinsic bytes by prefixing the extrinsic length.
-        // The length is handled deserializing `ChainBlockExtrinsic`, therefore the first byte is not needed.
+        // The length is handled by deserializing `ChainBlockExtrinsic`, therefore the first byte is not needed.
         let extrinsic = ExtrinsicDetails::<SubstrateConfig>::decode_from(
             1,
             tx_encoded.encoded(),

core/src/custom_values/address.rs

@@ -11,7 +11,7 @@ use derive_where::derive_where;
 /// Use this with [`Address::IsDecodable`].
 pub use crate::utils::Yes;
 
-/// This represents the address of a custom value in in the metadata.
+/// This represents the address of a custom value in the metadata.
 /// Anything that implements it can be used to fetch custom values from the metadata.
 /// The trait is implemented by [`str`] for dynamic lookup and [`StaticAddress`] for static queries.
 pub trait Address {