Clean up some formatting problems in the setFrameRate ndk docs

Bug: 152413112

Test: Unfortunately there's no convenient way to build the ndk docs
locally, so we're just going to submit and see if the regenerated DAC
docs look correct. I talked with Dan Albert on the ndk team about this,
and he decided to reopen b/115644359 to see if we can get some easy way
to build the ndk docs locally again, so we can verify minor formatting
fixes like this.

Change-Id: Ie29a19a386887df6305ee9a4447702126fed7972
diff --git a/include/android/surface_control.h b/include/android/surface_control.h
index c30dcfe..cbcf6ec 100644
--- a/include/android/surface_control.h
+++ b/include/android/surface_control.h
@@ -409,7 +409,7 @@
 
 #if __ANDROID_API__ >= 30
 
-/*
+/**
  * Sets the intended frame rate for |surface_control|.
  *
  * On devices that are capable of running the display at different refresh rates, the system may
@@ -421,9 +421,9 @@
  *
  * |frameRate| is the intended frame rate of this surface, in frames per second. 0 is a special
  * value that indicates the app will accept the system's choice for the display frame rate, which is
- * the default behavior if this function isn't called. The frameRate param does *not* need to be a
- * valid refresh rate for this device's display - e.g., it's fine to pass 30fps to a device that can
- * only run the display at 60fps.
+ * the default behavior if this function isn't called. The frameRate param does <em>not</em> need to
+ * be a valid refresh rate for this device's display - e.g., it's fine to pass 30fps to a device
+ * that can only run the display at 60fps.
  *
  * |compatibility| The frame rate compatibility of this surface. The compatibility value may
  * influence the system's choice of display frame rate. To specify a compatibility use the