Merge pull request ethhub-io#140 from fixone/patch-1

clarify units of measurements

ethereum-roadmap/serenity-phases/eth-2.0-economics.md

@@ -37,8 +37,8 @@ We can calculate this scale using the spec. There are a lot of variables in doin
 | :--- | :--- |
 | ETH stake | 32 |
 | Shards | 1024 |
-| Slot time | 6 |
-| Epoch Length | 64 |
+| Slot time (in seconds) | 6 |
+| Epoch Length (in slots) | 64 |
 | Base Reward Quotient | 2048 |
 
 From here we can start to calculate the **outputs** using a single **assumption** which is **total network stake.** \(Let's assume 10,000,000 in the example\)
@@ -107,4 +107,4 @@ More traditional investment alternatives such as bonds, certificates of deposit,
 There is over [500 alternative PoS coins](https://masternodes.online/), with a reward structure. Why stake ETH, when one can earn more, with potentially less infrastructure and risk, on another coin?
 
 ## Spreadsheet Example
-Click [here](https://docs.google.com/spreadsheets/d/1SZBJsTHBFmRlo6aLZ0ex_bnTO3MqQrsZK9yLWqL4r68/edit?usp=sharing) to see calucations of network and personal staking variables given the latest spec.
+Click [here](https://docs.google.com/spreadsheets/d/1SZBJsTHBFmRlo6aLZ0ex_bnTO3MqQrsZK9yLWqL4r68/edit?usp=sharing) to see calculations of network and personal staking variables given the latest spec.