fix typos (#4439)

massa-factory-worker/factory.md

@@ -50,7 +50,7 @@ If the address linked to a stored staking key was selected, launch the block pro
 The production of a block `B` at slot `S` happens in steps:
 * prepare the header content with the obvious fields of the header (eg. creator public key, slot)
 * ask consensus for `best_parents` which will be the parents set inside the header
-* ask pool for the endorsmeents to add to the header given the `BlockId` of `B`'s parent in `B`'s thread
+* ask pool for the endorsements to add to the header given the `BlockId` of `B`'s parent in `B`'s thread
 * define `remaining_gas = MAX_BLOCk_GAS`  which is the remaining gas in the block
 * define `remaining_space = MAX_BLOCK_SIZE` which is the remaining operation space in the block in bytes
 * define `balance_cache: Map<Address, Amount> = Default::default()` which is a cache of balance