Update variables in the potential mana section

This change is mostly cosmetic; the result does not change with this update.

tips/TIP-0039/tip-0039.md

@@ -317,11 +317,13 @@ applies the decay to the result, where:
       - `Mana Generated = Generate Mana(Amount, Slots Since Epoch Start)`
   - If `Output Creation Epoch < Transaction Creation Epoch - 1`:
     - Let `Epoch Index Diff` be `Transaction Creation Epoch - Output Creation Epoch`.
-    - Return `Potential Mana_0 - Potential Mana_n_1 + Potential Mana_n`, where
-      - `Potential Mana_n = Decay(Generate Mana(Amount, Slots Before Next Epoch), Epoch Index Diff)`
-      - `Potential Mana_n_1 = Decay(c, Epoch Index Diff - 1)`
-      - `Potential Mana_0 = c + Generate Mana(Amount, Slots Since Epoch Start) - (c >> Decay Factors Exponent)`
+    - Return `Potential Mana First Epoch + Potential Mana Intermediate Epochs + Potential Mana Last Epoch - Correction Term`, where
+      - `Potential Mana First Epoch = Decay(Generate Mana(Amount, Slots Before Next Epoch), Epoch Index Diff)`
+      - `Potential Mana Intermediate Epochs = c - c2`
+      - `Potential Mana Last Epoch = Generate Mana(Amount, Slots Since Epoch Start)`
+      - `Correction Term = c >> Decay Factors Exponent`
       - `c = Multiplication And Shift(Upper Bits(Amount, 32), Lower Bits(Amount, 32), Decay Factor Epochs Sum * Generation Rate , Decay Factor Epochs Sum Exponent+generationRateExponent-slotsPerEpochExponent)`.
+      - `c2 = Decay(c, Epoch Index Diff - 1)`
 
 ## Stored Mana