marsenne-twister: typo an/a
client-certificates: reword for clarity
crime-and-breach: typo secret -> sequence
prime-numbers: factorization -> prime factorization
using-euler's-theorem: phi counts integers that are coprime *and <= than*
montgomery-ladder: correct text about L_2 and L_3

Text here essentially says:
  L_3 = (L_2 << 1) + k_j
which is incorrect.  Text should describe this relationship:
  L_2 = (L_3 << 1) + k_j
so it should say L_2 is indeed...
montgomery-ladder: fix $ wrapping of g^{L_0}