docs: fix typos (backport #21514) (#21551)

Co-authored-by: omahs <73983677+omahs@users.noreply.github.com>

docs/build/building-apps/05-app-testnet.md

@@ -76,7 +76,7 @@ When creating a testnet the important part is migrate the validator set from man
 	}
 	iterator.Close()
 
-	// Remove all valdiators from last validators store
+	// Remove all validators from last validators store
 	iterator = app.StakingKeeper.LastValidatorsIterator(ctx)
 	for ; iterator.Valid(); iterator.Next() {
 		app.StakingKeeper.LastValidatorPower.Delete(iterator.Key())

docs/build/building-modules/03-msg-services.md

@@ -61,7 +61,7 @@ It is recommended to implement all validation checks in a separate function that
 ```go
 ValidateMsgA(msg MsgA, now Time, gm GasMeter) error {
 	if now.Before(msg.Expire) {
-		return sdkerrrors.ErrInvalidRequest.Wrap("msg expired")
+		return sdkerrors.ErrInvalidRequest.Wrap("msg expired")
 	}
 	gm.ConsumeGas(1000, "signature verification")
 	return signatureVerificaton(msg.Prover, msg.Data)