Repository: facebook/react
Pull request: Update types for `NonIdleLanes` and `IdleLane`

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## Summary

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 Explain the **motivation** for making this change. What existing problem does the pull request solve?
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- `NonIdleLanes` is not typed.
- `IdleLane` is typed as `Lanes` but it should be types as `Lane` based on the convention of surrounding code. 

## How did you test this change?

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Run `yarn flow dom` and pass.

Changed files:
filename: packages/react-reconciler/src/ReactFiberLane.new.js
patch: @@ -73,10 +73,10 @@ export const SomeRetryLane: Lane = RetryLane1;
 
 export const SelectiveHydrationLane: Lane = /*          */ 0b0001000000000000000000000000000;
 
-const NonIdleLanes = /*                                 */ 0b0001111111111111111111111111111;
+const NonIdleLanes: Lanes = /*                          */ 0b0001111111111111111111111111111;
 
 export const IdleHydrationLane: Lane = /*               */ 0b0010000000000000000000000000000;
-export const IdleLane: Lanes = /*                       */ 0b0100000000000000000000000000000;
+export const IdleLane: Lane = /*                        */ 0b0100000000000000000000000000000;
 
 export const OffscreenLane: Lane = /*                   */ 0b1000000000000000000000000000000;
 

filename: packages/react-reconciler/src/ReactFiberLane.old.js
patch: @@ -73,10 +73,10 @@ export const SomeRetryLane: Lane = RetryLane1;
 
 export const SelectiveHydrationLane: Lane = /*          */ 0b0001000000000000000000000000000;
 
-const NonIdleLanes = /*                                 */ 0b0001111111111111111111111111111;
+const NonIdleLanes: Lanes = /*                          */ 0b0001111111111111111111111111111;
 
 export const IdleHydrationLane: Lane = /*               */ 0b0010000000000000000000000000000;
-export const IdleLane: Lanes = /*                       */ 0b0100000000000000000000000000000;
+export const IdleLane: Lane = /*                        */ 0b0100000000000000000000000000000;
 
 export const OffscreenLane: Lane = /*                   */ 0b1000000000000000000000000000000;