chore: fix some minor issues in the comments (#2106)

Signed-off-by: withtimezone <with_timezone@outlook.com>

historic/src/storage/storage_info.rs

@@ -60,7 +60,7 @@ impl<'atblock> AnyStorageInfo<'atblock> {
         Ok(info)
     }
 
-    /// Is the storage entry a map (ie something we'd provide extra keys to to access a value, or otherwise iterate over)?
+    /// Is the storage entry a map (ie something we'd provide extra keys to access a value, or otherwise iterate over)?
     pub fn is_map(&self) -> bool {
         match self {
             AnyStorageInfo::Legacy(info) => !info.info.keys.is_empty(),

rpcs/src/client/mock_rpc_client.rs

@@ -255,7 +255,7 @@ pub struct Json<T>(pub T);
 
 impl Json<serde_json::Value> {
     /// Create a [`Json<serde_json::Value>`] from some serializable value.
-    /// Useful when value types are heterogenous.
+    /// Useful when value types are heterogeneous.
     pub fn value_of<T: serde::Serialize>(item: T) -> Self {
         Json(serde_json::to_value(item).expect("item cannot be converted to a serde_json::Value"))
     }

testing/integration-tests/src/full_client/client/archive_rpcs.rs

@@ -32,7 +32,7 @@ async fn fetch_finalized_blocks<T: Config>(
         .subscribe_finalized()
         .await
         .expect("issue subscribing to finalized in fetch_finalized_blocks")
-        .skip(1) // <- skip first block incase next is close to being ready already.
+        .skip(1) // <- skip first block in case next is close to being ready already.
         .take(n)
         .map(|r| r.expect("issue fetching block in fetch_finalized_blocks"))
 }