Improve documentation of Singleton functions, change to createInstance (#2585)

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/+extensions/__tests__/extensions.test.tsx

@@ -42,16 +42,16 @@ describe("Extensions", () => {
     UserStore.resetInstance();
     ThemeStore.resetInstance();
 
-    await UserStore.getInstanceOrCreate().load();
-    await ThemeStore.getInstanceOrCreate().init();
+    await UserStore.createInstance().load();
+    await ThemeStore.createInstance().init();
 
     ExtensionLoader.resetInstance();
     ExtensionDiscovery.resetInstance();
     Extensions.installStates.clear();
 
-    ExtensionDiscovery.getInstanceOrCreate().uninstallExtension = jest.fn(() => Promise.resolve());
+    ExtensionDiscovery.createInstance().uninstallExtension = jest.fn(() => Promise.resolve());
 
-    ExtensionLoader.getInstanceOrCreate().addExtension({
+    ExtensionLoader.createInstance().addExtension({
       id: "extensionId",
       manifest: {
         name: "test",

src/renderer/components/dock/__test__/log-resource-selector.test.tsx

@@ -44,8 +44,8 @@ const getFewPodsTabData = (): LogTabData => {
 
 describe("<LogResourceSelector />", () => {
   beforeEach(() => {
-    UserStore.getInstanceOrCreate();
-    ThemeStore.getInstanceOrCreate();
+    UserStore.createInstance();
+    ThemeStore.createInstance();
   });
 
   afterEach(() => {

src/renderer/components/layout/__test__/main-layout-header.test.tsx

@@ -16,7 +16,7 @@ const cluster: Cluster = new Cluster({
 
 describe("<MainLayoutHeader />", () => {
   beforeEach(() => {
-    ClusterStore.getInstanceOrCreate();
+    ClusterStore.createInstance();
   });
 
   afterEach(() => {