Address review comments (#3515)

Somehow I missed these in my previous patch.

packages/flutter/lib/src/widgets/basic.dart

@@ -1720,18 +1720,19 @@ class Flexible extends ParentDataWidget<Flex> {
 
 /// A paragraph of rich text.
 ///
-/// The [RichText] widget displays text using a variety of different styles. The
+/// The [RichText] widget displays text that uses multiple different styles. The
 /// text to display is described using a tree of [TextSpan] objects, each of
-/// which has an associated style, which is used for that subtree. The text
-/// might break across multiple lines or might all be displayed on the layout
-/// constraints.
+/// which has an associated style that is used for that subtree. The text might
+/// break across multiple lines or might all be displayed on the same line
+/// depending on the layout constraints.
 ///
 /// Text displayed in a [RichText] widget must be explicitly styled. When
-/// picking which style to use, consider using the closest enclosing
-/// [DefaultTextStyle] to provide defaults.
+/// picking which style to use, consider using [DefaultTextStyle.of] the current
+/// [BuildContext] to provide defaults.
 ///
-/// All the text uses the same style, consider using the [Text] widget, which is
-/// less verbose and integrates with [DefaultTextStyle] for default styling.
+/// When all the text uses the same style, consider using the [Text] widget,
+/// which is less verbose and integrates with [DefaultTextStyle] for default
+/// styling.
 ///
 /// See also:
 ///
@@ -1791,15 +1792,15 @@ class DefaultTextStyle extends InheritedWidget {
 /// A run of text with a single style.
 ///
 /// The [Text] widget displays a string of text with single style. The string
-/// might break across multiple lines or might all be displayed on the layout
-/// constraints.
+/// might break across multiple lines or might all be displayed on the same line
+/// depending on the layout constraints.
 ///
 /// The [style] argument is optional. When omitted, the text will use the style
-/// from the closest enclosing [DefaultTextStyle] by default. If the given
-/// style's [TextStyle.inherit] property is true, the given style will be
-/// merged with the closest enclosing [DefaultTextStyle]. This merging behavior
-/// is useful, for example, to make the text bold while using the default font
-/// family and size.
+/// from the closest enclosing [DefaultTextStyle]. If the given style's
+/// [TextStyle.inherit] property is true, the given style will be merged with
+/// the closest enclosing [DefaultTextStyle]. This merging behavior is useful,
+/// for example, to make the text bold while using the default font family and
+/// size.
 ///
 /// To display text that uses multiple styles (e.g., a paragraph with some bold
 /// words), use [RichText].