chore(upgrade): cleaning (#10413)

## Description

cosmetic changes spotted when reading docs and code.

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

docs/core/upgrade.md

@@ -151,6 +151,6 @@ app.UpgradeKeeper.SetUpgradeHandler("my-plan", func(ctx sdk.Context, plan upgrad
 
 You can sync a full node to an existing blockchain which has been upgraded using Cosmovisor
 
-In order to successfully sync, you must start with the initial binary that the blockchain started with at genesis. Cosmovisor will handle downloading and switching to the binaries associated with each sequential upgrade.
+In order to successfully sync, you must start with the initial binary that the blockchain started with at genesis. If all Software Upgrade Plans contain binary instruction then you can run Cosmovisor with auto download option to automatically handle downloading and switching to the binaries associated with each sequential upgrade. Otherwise you need to manually provide all binaries to Cosmovisor.
 
 To learn more about Cosmovisor, see the [Cosmovisor Quick Start](../run-node/cosmovisor.md).

types/module/module.go

@@ -415,32 +415,25 @@ func (m Manager) RunMigrations(ctx sdk.Context, cfg Configurator, fromVM Version
 		fromVersion, exists := fromVM[moduleName]
 		toVersion := module.ConsensusVersion()
 
-		// Only run migrations when the module exists in the fromVM.
-		// Run InitGenesis otherwise.
+		// We run migration if the module is specified in `fromVM`.
+		// Otherwise we run InitGenesis.
 		//
-		// the module won't exist in the fromVM in two cases:
+		// The module won't exist in the fromVM in two cases:
 		// 1. A new module is added. In this case we run InitGenesis with an
 		// empty genesis state.
-		// 2. An existing chain is upgrading to v043 for the first time. In this case,
-		// all modules have yet to be added to x/upgrade's VersionMap store.
+		// 2. An existing chain is upgrading from version < 0.43 to v0.43+ for the first time.
+		// In this case, all modules have yet to be added to x/upgrade's VersionMap store.
 		if exists {
 			err := c.runModuleMigrations(ctx, moduleName, fromVersion, toVersion)
 			if err != nil {
 				return nil, err
 			}
 		} else {
-			cfgtor, ok := cfg.(configurator)
-			if !ok {
-				// Currently, the only implementator of Configurator (the interface)
-				// is configurator (the struct).
-				return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidType, "expected %T, got %T", configurator{}, cfg)
-			}
-
-			moduleValUpdates := module.InitGenesis(ctx, cfgtor.cdc, module.DefaultGenesis(cfgtor.cdc))
+			moduleValUpdates := module.InitGenesis(ctx, c.cdc, module.DefaultGenesis(c.cdc))
 			// The module manager assumes only one module will update the
-			// validator set, and that it will not be by a new module.
+			// validator set, and it can't be a new module.
 			if len(moduleValUpdates) > 0 {
-				return nil, sdkerrors.Wrapf(sdkerrors.ErrLogic, "validator InitGenesis updates already set by a previous module")
+				return nil, sdkerrors.Wrapf(sdkerrors.ErrLogic, "validator InitGenesis update is already set by another module")
 			}
 		}