docs: Javadoc fixes

A summary line failed to end with a period, with catastrophic
results--a table got pulled into the Javadoc summary table, which
broke the whole page's formatting. Putting a period at the end of
the summary line fixed everything.

Also made some other Javadoc fixes while I was in there--some
angle brackets needed to be escaped to display properly.

Doc is staged to:

http://go/dac-stage/reference/android/R.styleable

Bug: 119539013
Test: make ds-docs
Change-Id: If44050d8b03e70e619f0a2588ebc3ab07db7c4f2
Exempt-From-Owner-Approval: Doc-only change
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 6b5a914..5eb4bd0 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -5957,7 +5957,7 @@
         <attr name="insetBottom" format="fraction|dimension" />
     </declare-styleable>
 
-    <!-- Drawable used to draw animated images (gif) -->
+    <!-- Drawable used to draw animated images (gif). -->
     <declare-styleable name="AnimatedImageDrawable">
         <!-- Identifier of the image file. This attribute is mandatory.
              It must be an image file with multiple frames, e.g. gif or webp -->
@@ -8835,8 +8835,8 @@
         <attr name="name" />
     </declare-styleable>
 
-    <!-- Attributes that are read when parsing a <font> tag, which is a child of
-         <font-family>. This represents an actual font file and its attributes. -->
+    <!-- Attributes that are read when parsing a &lt;font&gt; tag, which is a child of
+         &lt;font-family&gt;. This represents an actual font file and its attributes. -->
     <declare-styleable name="FontFamilyFont">
         <!-- The style of the given font file. This will be used when the font is being loaded into
          the font stack and will override any style information in the font's header tables. If
@@ -8867,7 +8867,7 @@
         <attr name="fontVariationSettings" format="string" />
     </declare-styleable>
 
-    <!-- Attributes that are read when parsing a <fontfamily> tag. -->
+    <!-- Attributes that are read when parsing a &lt;fontfamily&gt; tag. -->
     <declare-styleable name="FontFamily">
         <!-- The authority of the Font Provider to be used for the request. -->
         <attr name="fontProviderAuthority" format="string" />