Document some private components

docs/private-apis.md

@@ -17,7 +17,7 @@ Every store has a private API for registering private selectors/actions:
 ## blocks
 
 Private exports:
-- `isUnmodifiedBlockContent` (added Sep 2024, one usage in `block-editor`)
+- `isUnmodifiedBlockContent`: added Sep 2024, one usage in `block-editor`
 
 ### `core/blocks` store
 
@@ -99,7 +99,7 @@ Private exports:
 - `useHasImageSettingsPanel`
 - `useHasTypographyPanel`
 - `useSettingsForBlockElement`
-- `ExperimentalBlockCanvas`
+- `ExperimentalBlockCanvas`: has several extra props compared to `BlockCanvas`: `contentRef`, `shouldIframe`, `iframeProps`.
 - `ExperimentalBlockEditorProvider`
 - `getDuotoneFilter`
 - `getRichTextValues`
@@ -128,10 +128,10 @@ Private exports:
 - `globalStylesLinksDataKey`
 - `selectBlockPatternsKey`
 - `requiresWrapperOnCopy`
-- `PrivateRichText`
-- `PrivateInserterLibrary`
+- `PrivateRichText`: has an extra prop `readOnly` added in #58916 and #60327 (Feb and Mar 2024).
+- `PrivateInserterLibrary`: has an extra prop `onPatternCategorySelection` added in #62130 (May 2024).
 - `reusableBlocksSelectKey`
-- `PrivateBlockPopover`
+- `PrivateBlockPopover`: has two extra props, `__unstableContentRef` and `__unstablePopoverSlot`.
 - `PrivatePublishDateTimePicker`
 - `useSpacingSizes`
 - `useBlockDisplayTitle`