Fix typos and markdown (#2388)

* Fix typos

* Align properly

* Update core/consensus/slots/src/lib.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/network/src/test/mod.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/finality-grandpa/src/communication/mod.rs

Co-Authored-By: cmichi <mich@elmueller.net>

* Update core/consensus/common/src/import_queue.rs

Co-Authored-By: cmichi <mich@elmueller.net>

substrate/core/sr-primitives/src/generic/mod.rs

@@ -52,7 +52,7 @@ fn encode_with_vec_prefix<T: Encode, F: Fn(&mut Vec<u8>)>(encoder: F) -> Vec<u8>
 	v.resize(reserve, 0);
 	encoder(&mut v);
 
-	// need to prefix with the total length to ensure it's binary comptible with
+	// need to prefix with the total length to ensure it's binary compatible with
 	// Vec<u8>.
 	let mut length: Vec<()> = Vec::new();
 	length.resize(v.len() - reserve, ());

substrate/core/sr-primitives/src/generic/tests.rs

@@ -27,7 +27,7 @@ fn system_digest_item_encoding() {
 	assert_eq!(encoded, vec![
 		// type = DigestItemType::AuthoritiesChange
 		1,
-		// number of items in athorities set
+		// number of items in authorities set
 		12,
 		// authorities
 		10, 0, 0, 0,

substrate/core/sr-primitives/src/transaction_validity.rs

@@ -49,7 +49,7 @@ pub enum TransactionValidity {
 		requires: Vec<TransactionTag>,
 		/// Provided tags
 		///
-		/// A list of tags this transaction provides. Successfuly importing the transaction
+		/// A list of tags this transaction provides. Successfully importing the transaction
 		/// will enable other transactions that depend on (require) those tags to be included as well.
 		/// Provided and requried tags allow Substrate to build a dependency graph of transactions
 		/// and import them in the right (linear) order.