message: Fix keyvault changelog nit
  Followup from
diff: ### Breaking Changes
  -- Updated `MaxPageResults` type to `int32_t` affecting:
  - - GetDeletedKeysOptions.
  - - GetPropertiesOfKeysOptions.
  - - GetPropertiesOfKeyVersionsOptions.
  +- Updated `MaxPageResults` type to `int32_t`, from `uint32_t`, affecting:
  + - `GetDeletedKeysOptions()`.
  + - `GetPropertiesOfKeysOptions()`.
  + - `GetPropertiesOfKeyVersionsOptions()`.
  - Updated `CreateRsaKeyOptions::KeySize` type from `uint64_t` to `int64_t`.
  - Updated `CreateRsaKeyOptions::PublicExponent` type from `uint64_t` to `int64_t`.
  - Updated `CreateOctKeyOptions::KeySize` type from `uint64_t` to `int64_t`.
  