misc: Fix spelling issues

Misspellings were identified by:
  https://github.com/marketplace/actions/check-spelling

* Initial corrections based on forbidden patterns from the action
* Additional corrections by Google Chrome auto-suggest
* Some manual corrections
* Adding markdown bullets to readme credits section

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

block/src/qcow/mod.rs

@@ -1200,7 +1200,7 @@ impl QcowFile {
     }
 
     // Allocate and initialize a new data cluster. Returns the offset of the
-    // cluster in to the file on success.
+    // cluster into the file on success.
     fn append_data_cluster(&mut self, initial_data: Option<Vec<u8>>) -> std::io::Result<u64> {
         let new_addr: u64 = self.get_new_cluster(initial_data)?;
         // The cluster refcount starts at one indicating it is used but doesn't need COW.

block/src/qcow/refcount.rs

@@ -28,7 +28,7 @@ pub enum Error {
     /// `NeedNewCluster` - Handle this error by allocating a cluster and calling the function again.
     #[error("New cluster needs to be allocated for refcounts")]
     NeedNewCluster,
-    /// `ReadingRefCounts` - Error reading the file in to the refcount cache.
+    /// `ReadingRefCounts` - Error reading the file into the refcount cache.
     #[error("Failed to read the file into the refcount cache: {0}")]
     ReadingRefCounts(io::Error),
 }