fix: typos in documentation files (yearn#528)

* Update BaseStrategy.md

* Update BaseStrategy.md

* Update BaseStrategy.md

Author: kilavvy

docs/developers/smart-contracts/V2/BaseStrategy.md

@@ -142,7 +142,7 @@ Initializes the Strategy, this is called only once, when the
 |`_strategist` | address | The address to assign as `strategist`.
 The strategist is able to change the reward address
 |`_rewards` | address |  The address to use for pulling rewards.
-|`_keeper` | address | The adddress of the _keeper._keeper
+|`_keeper` | address | The address of the _keeper._keeper
 can harvest and tend a strategy.
 
 ### setHealthCheck

docs/developers/smart-contracts/deprecated/V2/version-0.4.2/smart-contracts/BaseStrategy.md

@@ -88,7 +88,7 @@ This Strategy's name.
 |`_strategist` | address | The address to assign as `strategist`.
 The strategist is able to change the reward address
 |`_rewards` | address |  The address to use for pulling rewards.
-|`_keeper` | address | The adddress of the _keeper. _keeper
+|`_keeper` | address | The address of the _keeper. _keeper
 can harvest and tend a strategy.
 
 ### setStrategist

docs/developers/smart-contracts/deprecated/V2/version-0.4.3/smart-contracts/BaseStrategy.md

@@ -88,7 +88,7 @@ This Strategy's name.
 |`_strategist` | address | The address to assign as `strategist`.
 The strategist is able to change the reward address
 |`_rewards` | address |  The address to use for pulling rewards.
-|`_keeper` | address | The adddress of the _keeper. _keeper
+|`_keeper` | address | The address of the _keeper. _keeper
 can harvest and tend a strategy.
 
 ### setStrategist