Docs: Fix grammar.md manifest entry; (chore) update data docs (#10014)

docs/data/data-core-editor.md

@@ -259,7 +259,8 @@ Whether the post can be saved.
 ### isEditedPostEmpty
 
 Returns true if the edited post has content. A post has content if it has at
-least one block or otherwise has a non-empty content property assigned.
+least one saveable block or otherwise has a non-empty content property
+assigned.
 
 *Parameters*
 
@@ -989,6 +990,19 @@ default post format. Returns null if the format cannot be determined.
 
 Suggested post format.
 
+### getBlocksForSerialization
+
+Returns a set of blocks which are to be used in consideration of the post's
+generated save content.
+
+*Parameters*
+
+ * state: Editor state.
+
+*Returns*
+
+Filtered set of blocks for save.
+
 ### getEditedPostContent
 
 Returns the content of the post being edited, preferring raw string edit

docs/manifest.json

@@ -11,6 +11,12 @@
 		"markdown_source": "https://github.com/WordPress/gutenberg/master/docs/language.md",
 		"parent": null
 	},
+	{
+		"title": "The Gutenberg block grammar",
+		"slug": "grammar",
+		"markdown_source": "https://github.com/WordPress/gutenberg/master/docs/grammar.md",
+		"parent": "language"
+	},
 	{
 		"title": "Block API",
 		"slug": "block-api",

docs/root-manifest.json

@@ -11,6 +11,12 @@
 		"markdown_source": "https:\/\/github.com\/WordPress\/gutenberg\/master\/docs\/language.md",
 		"parent": null
 	},
+	{
+		"title": "The Gutenberg block grammar",
+		"slug": "grammar",
+		"markdown_source": "https://github.com/WordPress/gutenberg/master/docs/grammar.md",
+		"parent": "language"
+	},
 	{
 		"title": "Block API",
 		"slug": "block-api",