Trivial spacing changes in RELEASE_NOTES

documentation/RELEASE_NOTES.html

@@ -198,6 +198,7 @@ them for continuous integration testing of static builds.</p>
 <p>The problem building for the ios-x86 simulator target architecture has been
 resolved.</p>
 
+
 <h2 align="center">Changes between 3.14.12.3 and 3.14.12.4</h2>
 
 <h3>New test for environment variables</h3>
@@ -386,6 +387,7 @@ with an increasing delay between messages up to hourly.</p>
 <p>This fixes <a href="https://bugs.launchpad.net/bugs/597054">launchpad bug
 597054</a>.</p>
 
+
 <h2 align="center">Changes between 3.14.12.2 and 3.14.12.3</h2>
 
 <h4>Hex literals in CALC expressions</h4>
@@ -533,6 +535,7 @@ entries in the <tt>CONFIG_SITE.darwinCommon.darwinCommon</tt> file in the
 versions of MacOS-X come with an implementation of readline, so those additional
 code repositories are no longer required.</p>
 
+
 <h2 align="center">Changes between 3.14.12.1 and 3.14.12.2</h2>
 
 <h4>Path for Cap5 loadable library changed</h4>
@@ -2199,6 +2202,7 @@ been included using the <tt>EPICS_BASE_IOC_LIBS</tt> or
 <tt>EPICS_BASE_HOST_LIBS</tt> variables that are set in Base, and thus no
 changes will be needed.</p>
 
+
 <h2 align="center">Changes between 3.14.8.2 and 3.14.9</h2>
 
 <h4>Cygwin Builds</h4>
@@ -2472,6 +2476,7 @@ targets.</p>
 
 <p>Added support for EPICS_HOST_ARCH=darwin-x86.</p>
 
+
 <h2 align="center">Changes between 3.14.8.1 and 3.14.8.2</h2>
 
 <h4>epicsStrtod</h4>
@@ -2481,6 +2486,7 @@ targets.</p>
 managed to break the use of this in the R3.14.8.1 release. This is now
 fixed.</p>
 
+
 <h2 align="center">Changes between 3.14.8 and 3.14.8.1</h2>
 
 <h4>Version Numbering</h4>
@@ -2527,6 +2533,7 @@ on win32 architectures.</p>
   </li>
 </ul>
 
+
 <h2 align="center">Changes between 3.14.7 and 3.14.8</h2>
 
 <h4>New host targets</h4>
@@ -2745,6 +2752,7 @@ could not be created. This is fixed.</p>
 <p>222 - osiSpawnDetachedProcess doesnt close open files in dupicate process
 on POSIX</p>
 
+
 <h2 align="center">Changes between 3.14.6 and 3.14.7</h2>
 
 <h4>selRecord</h4>
@@ -2879,6 +2887,7 @@ can cause an IOC to crash.</p>
 when the ARCH defined in the ioc*/Makefile is present in BUILD_ARCHS for the
 build.</p>
 
+
 <h2 align="center">Changes between 3.14.5 and 3.14.6</h2>
 
 <h4>CA command line tools complete</h4>
@@ -3131,6 +3140,7 @@ channels)</p>
   </li>
 </ul>
 
+
 <h2 align="center">Changes between 3.14.4 and 3.14.5</h2>
 
 <h4>dbtr</h4>
@@ -3310,9 +3320,8 @@ standard C escape characters to \xxx characters.</p>
 command, add <code>registrar(iocshSystemCommand)</code> to an application
 database description file.</p>
 
-<center>
-<h2>Changes between 3.14.3 and 3.14.4</h2>
-</center>
+
+<h2 align="center">Changes between 3.14.3 and 3.14.4</h2>
 
 <h4>sCalcPostfix</h4>
 
@@ -3362,9 +3371,8 @@ successfully connects.</p>
 <p>Thanks to Mark Rivers for initially reporting the bug and energetically
 assisting with identifying the cause.</p>
 
-<center>
-<h2>Changes between 3.14.2 and 3.14.3</h2>
-</center>
+
+<h2 align="center">Changes between 3.14.2 and 3.14.3</h2>
 
 <h4>TPRO output</h4>
 
@@ -3565,9 +3573,8 @@ symptom was a hang during process exit. A workaround was installed.</p>
 <p>A patch was made to allow multiple CA servers on MAC OSX. OSX is a recent
 branch off of BSD and therefore requires socket option SO_REUSEPORT.</p>
 
-<center>
-<h2>Changes between 3.14.1 and 3.14.2</h2>
-</center>
+
+<h2 align="center">Changes between 3.14.1 and 3.14.2</h2>
 
 <p><strong>Build System</strong></p>
 
@@ -3652,9 +3659,8 @@ that it ignores case.</p>
 <p>macParseDefns did not check for handle==NULL. The documentation for
 macParseDefns was not correct.</p>
 
-<center>
-<h2>Changes between 3.14.0beta2 and 3.14.1</h2>
-</center>
+
+<h2 align="center">Changes between 3.14.0beta2 and 3.14.1</h2>
 
 <p><strong>function - New Database Definition Keyword</strong></p>