fix typo

git-svn-id: http://root.cern.ch/svn/root/trunk@34166 27541ba8-7e3a-0410-8455-c3a389f83636

io/doc/v528/index.html

@@ -22,7 +22,7 @@ When reading the file where always in the os cache (since we are focusing evalua
 The number of event actually read varies from file set to file set but was calibrated to result 
 in about 10s of cpu time.  The files are read using a library generated with TFile::MakeProject. 
 <p/>
-The object-wise files are between 2% and 10% larger compared to their member-wise coutnerpart.
+The object-wise files are between 2% and 10% larger compared to their member-wise counterpart.
 <p/>
 The CPU time for reading object-wise files is 12% higher for split files 
 and 30% higher for non-split files. 
@@ -126,4 +126,3 @@ that associates them to the current directory (DirectoryAutoAdd) will now reset
 ownsership confusion.</li>
 </ul>
 
-