Minor changes to ECDSA notation

Digital-Signatures/Elliptic-Curve-DSA/README.md

@@ -20,7 +20,7 @@ Consider `Alice` as the person who is generating a signature of a message `M` an
 Let us define the notations that will be used throughout this writeup:  
 > 1. <strong>G</strong> - a point on the Elliptic Curve, chosen as the base point
 > 2. <strong>x<sub>Q</sub>, y<sub>Q</sub></strong> - x, y coordinates of a point Q on the Elliptic Curve
-> 3. **n** - order of the subgroup generated by P
+> 3. **n** - order of the subgroup generated by G
 > 4. **N** - order of the Elliptic Curve
 > 5. **p** - size of the finite field over which the Elliptic Curve is defined
 > 6. **e** - HASH(m), where HASH() is a [cryptographically secure hash function](https://en.wikipedia.org/wiki/Security_of_cryptographic_hash_functions#Provably_secure_hash_functions). A hashing algorithm is selected by signature generator and verifier when the communication between the two is just established.