typo fix

Release_Notes.md

@@ -2,7 +2,7 @@
 
 * Adds a usable, full RNS variant of BGV (as a more efficient alternative to BFV RNS variants for integer arithmetic)
 * Adds a fully functional threshold FHE capability to BGV, BFV, and CKKS to support multi-party computations
-* Adds an automated rescaling mode to the aproximate rescaling RNS variant of CKKS
+* Adds an automated rescaling mode to the approximate rescaling RNS variant of CKKS
 * Improves the performance of both CKKS RNS variants
 * Improves the performance of both BFV RNS variants
 * Makes NTL completely optional for all environments (no quad-precision floats are needed anymore)