Rename "loading" to "busy" in SuspenseConfig API (#15699)

loadingDelayMs -> busyDelayMs
minLoadingDurationMs -> busyMinDurationMs

packages/react-reconciler/src/ReactFiberScheduler.js

@@ -2003,11 +2003,11 @@ function computeMsUntilSuspenseLoadingDelay(
     return 0;
   }
 
-  const minLoadingDurationMs = (suspenseConfig.minLoadingDurationMs: any) | 0;
-  if (minLoadingDurationMs <= 0) {
+  const busyMinDurationMs = (suspenseConfig.busyMinDurationMs: any) | 0;
+  if (busyMinDurationMs <= 0) {
     return 0;
   }
-  const loadingDelayMs = (suspenseConfig.loadingDelayMs: any) | 0;
+  const busyDelayMs = (suspenseConfig.busyDelayMs: any) | 0;
 
   // Compute the time until this render pass would expire.
   const currentTimeMs: number = now();
@@ -2016,12 +2016,12 @@ function computeMsUntilSuspenseLoadingDelay(
     suspenseConfig,
   );
   const timeElapsed = currentTimeMs - eventTimeMs;
-  if (timeElapsed <= loadingDelayMs) {
+  if (timeElapsed <= busyDelayMs) {
     // If we haven't yet waited longer than the initial delay, we don't
     // have to wait any additional time.
     return 0;
   }
-  const msUntilTimeout = loadingDelayMs + minLoadingDurationMs - timeElapsed;
+  const msUntilTimeout = busyDelayMs + busyMinDurationMs - timeElapsed;
   // This is the value that is passed to `setTimeout`.
   return msUntilTimeout;
 }

packages/react-reconciler/src/ReactFiberSuspenseConfig.js

@@ -13,8 +13,8 @@ const {ReactCurrentBatchConfig} = ReactSharedInternals;
 
 export type SuspenseConfig = {|
   timeoutMs: number,
-  loadingDelayMs?: number,
-  minLoadingDurationMs?: number,
+  busyDelayMs?: number,
+  busyMinDurationMs?: number,
 |};
 
 export function requestCurrentSuspenseConfig(): null | SuspenseConfig {

packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.internal.js

@@ -2093,8 +2093,8 @@ describe('ReactSuspenseWithNoopRenderer', () => {
 
     const SUSPENSE_CONFIG = {
       timeoutMs: 10000,
-      loadingDelayMs: 500,
-      minLoadingDurationMs: 400,
+      busyDelayMs: 500,
+      busyMinDurationMs: 400,
     };
 
     let transitionToPage;