Fix spelling in histogtrams.xml;comment in header; format in cc file.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 7f449f5a0f258795861a456fbee1468e2ab2668f..7257711da28fa082263ae9b6e2c44ac1424e0ba2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -12641,6 +12641,14 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Net.SocketReceiveBufferUnchangeable" units="Bytes">
+  <owner>jar@chromium.org</owner>
+  <summary>
+    The size of a socket's receive buffer when the attempt to change it via
+    setsockopt failed.
+  </summary>
+</histogram>
+
 <histogram name="Net.SocketRequestTime">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
@@ -12706,14 +12714,6 @@ other types of suffix sets.
   </summary>
 </histogram>
 
-<histogram name="Net.SocketUnchangeableReceiveBuffer" units="Bytes">
-  <owner>jar@chromium.org</owner>
-  <summary>
-    The size of a socket's receive buffer when the attempt to change it via
-    setsockopt failed.
-  </summary>
-</histogram>
-
 <histogram name="Net.SocketUnchangeableSendBuffer" units="Bytes">
   <owner>jar@chromium.org</owner>
   <summary>