[RTL] Parse "\r\n" as a single paragraph break, add some documentation notes.

doc/classes/RichTextLabel.xml

@@ -5,6 +5,7 @@
 	</brief_description>
 	<description>
 		A control for displaying text that can contain custom fonts, images, and basic formatting. [RichTextLabel] manages these as an internal tag stack. It also adapts itself to given width/heights.
+		[b]Note:[/b] [method newline], [method push_paragraph], [code]"\n"[/code], [code]"\r\n"[/code], [code]p[/code] tag, and alignment tags start a new paragraph. Each paragraph is processed independently, in its own BiDi context. If you want to force line wrapping within paragraph, any other line breaking character can be used, for example, Form Feed (U+000C), Next Line (U+0085), Line Separator (U+2028).
 		[b]Note:[/b] Assignments to [member text] clear the tag stack and reconstruct it from the property's contents. Any edits made to [member text] will erase previous edits made from other manual sources such as [method append_text] and the [code]push_*[/code] / [method pop] methods.
 		[b]Note:[/b] RichTextLabel doesn't support entangled BBCode tags. For example, instead of using [code skip-lint][b]bold[i]bold italic[/b]italic[/i][/code], use [code skip-lint][b]bold[i]bold italic[/i][/b][i]italic[/i][/code].
 		[b]Note:[/b] [code]push_*/pop_*[/code] functions won't affect BBCode.
@@ -99,6 +100,7 @@
 			<return type="int" />
 			<description>
 				Returns the total number of lines in the text. Wrapped text is counted as multiple lines.
+				[b]Note:[/b] If [member visible_characters_behavior] is set to [constant TextServer.VC_CHARS_BEFORE_SHAPING] only visible wrapped lines are counted.
 				[b]Note:[/b] If [member threaded] is enabled, this method returns a value for the loaded part of the document. Use [method is_finished] or [signal finished] to determine whether document is fully loaded.
 			</description>
 		</method>