correction of minor typo

Author: Alvaro Arroyo Parejo

docs/docs/html/_sources/index.rst.txt

@@ -363,7 +363,7 @@ Changes
 * Dates/time columns or data have been converted to datetime ISO format.
 * Abbreviations contain now complete expressions (e.g., *close_appr_upcoming* to *close approaches_upcoming*)
 * The documentation explains how to obtain JSON and Table format from data retrieved from the library.
-* Time performance improvenment in obtaining physical properties.
+* Time performance improvement in obtaining physical properties.
 
 ----------------------
 Bug Fixes

docs/docs/html/index.html

@@ -2000,7 +2000,7 @@ <h3>Changes<a class="headerlink" href="#changes" title="Permalink to this headli
 <li><p>Dates/time columns or data have been converted to datetime ISO format.</p></li>
 <li><p>Abbreviations contain now complete expressions (e.g., <em>close_appr_upcoming</em> to <em>close approaches_upcoming</em>)</p></li>
 <li><p>The documentation explains how to obtain JSON and Table format from data retrieved from the library.</p></li>
-<li><p>Time performance improvenment in obtaining physical properties.</p></li>
+<li><p>Time performance improvement in obtaining physical properties.</p></li>
 </ul>
 </div>
 <div class="section" id="id3">