Merge PR #3507: Results from x/staking & x/slashing peer review

docs/spec/staking/hooks.md

@@ -15,8 +15,6 @@ following hooks can registered with staking:
    - called when a validator is bonded
  - `AfterValidatorBeginUnbonding(Context, ConsAddress, ValAddress)`
    - called when a validator begins unbonding
- - `AfterValidatorPowerDidChange(Context, ConsAddress, ValAddress)`
-   - called at EndBlock when a validator's power is changed
  - `BeforeDelegationCreated(Context, AccAddress, ValAddress)`
    - called when a delegation is created
  - `BeforeDelegationSharesModified(Context, AccAddress, ValAddress)`

docs/spec/staking/state.md

@@ -187,7 +187,6 @@ type RedelegationEntry struct {
     CompletionTime time.Time // unix time for redelegation completion
     InitialBalance sdk.Coin  // initial balance when redelegation started
     Balance        sdk.Coin  // current balance (current value held in destination validator)
-    SharesSrc      sdk.Dec   // amount of source-validator shares removed by redelegation
     SharesDst      sdk.Dec   // amount of destination-validator shares created by redelegation
 }
 ```