Merge PR #4599: Supply module spec

* supply spec

* update spec

* update other modules

* update distr

* update spec according to latest refactors

* Apply suggestions from code review

Co-Authored-By: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

* updated spec

* Apply suggestions from code review

Co-Authored-By: Marko <marbar3778@yahoo.com>

* final updates

* Apply suggestions from code review

Co-Authored-By: Alessio Treglia <quadrispro@ubuntu.com>

* word wrap in supply concepts

* edits to concepts

docs/spec/mint/02_state.md

@@ -6,7 +6,7 @@ The minter is a space for holding current inflation information.
 
  - Minter: `0x00 -> amino(minter)`
 
-```golang
+```go
 type Minter struct {
 	Inflation        sdk.Dec   // current annual inflation rate
 	AnnualProvisions sdk.Dec   // current annual exptected provisions
@@ -19,7 +19,7 @@ Minting params are held in the global params store.
 
  - Params: `mint/params -> amino(params)`
 
-```golang
+```go
 type Params struct {
 	MintDenom           string  // type of coin to mint
 	InflationRateChange sdk.Dec // maximum annual change in inflation rate

docs/spec/mint/03_begin_block.md

@@ -26,6 +26,7 @@ NextInflationRate(params Params, bondedRatio sdk.Dec) (inflation sdk.Dec) {
 	}
 
 	return inflation
+}
 ```
 
 ## NextAnnualProvisions
@@ -40,8 +41,7 @@ NextAnnualProvisions(params Params, totalSupply sdk.Dec) (provisions sdk.Dec) {
 
 ## BlockProvision
 
-Calculate the provisions generated for each block based on current 
-annual provisions 
+Calculate the provisions generated for each block based on current annual provisions. The provisions are then minted by the `mint` module's `ModuleMinterAccount` and then transferred to the `auth`'s `FeeCollector` `ModuleAccount`.
 
 ```
 BlockProvision(params Params) sdk.Coin {