fix some trivial typos

TODO.md

@@ -10,7 +10,7 @@ Grin is still an infant, much is left to be done and contributions are welcome.
   * Chain logic and related validation.
   * Efficient miner (as a distinct project).
   * User-friendly wallet (as a distinct project).
-  * Figure out if the rangeproofs can be eliminated under some cicrumstances while keeping security guarantes.
+  * Figure out if the rangeproofs can be eliminated under some cicrumstances while keeping security guarantees.
   * Website, logo design and all the cool stuff.
 
 Don't worry, we'll get there, with your help.

core/src/pow/siphash.rs

@@ -56,8 +56,7 @@ mod test {
 	use super::*;
 
 	/// Some test vectors hoisted from the Java implementation (adjusted from
-	/// the
-	/// fact that the Java impl uses a long, aka a signed 64 bits number).
+	/// the fact that the Java impl uses a long, aka a signed 64 bits number).
 	#[test]
 	fn hash_some() {
 		assert_eq!(siphash24([1, 2, 3, 4], 10), 928382149599306901);