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/srml/support/procedural/tools/derive/src/lib.rs

@@ -58,7 +58,7 @@ pub(crate) fn fields_access(
 /// For enums:
 ///   variant are tested in order of definition.
 ///   Empty variant is always true.
-///   Please use carefully, this will fully parse successfull variant twice.
+///   Please use carefully, this will fully parse successful variant twice.
 #[proc_macro_derive(Parse)]
 pub fn derive_parse(input: TokenStream) -> TokenStream {
 	let item = parse_macro_input!(input as syn::Item);

substrate/srml/support/procedural/tools/src/lib.rs

@@ -71,8 +71,8 @@ pub fn generate_hidden_includes(unique_id: &str, def_crate: &str) -> TokenStream
 	}
 }
 
-// fn to remove white spaces arount string types
-// (basically whitespaces arount tokens)
+// fn to remove white spaces around string types
+// (basically whitespaces around tokens)
 pub fn clean_type_string(input: &str) -> String {
 	input
 		.replace(" ::", "::")