Update documentation

01_query.html

@@ -119,12 +119,12 @@
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-   Joining Tables
+   5. Joining Tables
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-   Photometry
+   6. Photometry
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@@ -984,7 +984,7 @@ Results: None
 <div class="section" id="id1">
 <h3>Exercise<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
 <p>Read <a class="reference external" href="https://gea.esac.esa.int/archive/documentation/GDR2/Gaia_archive/chap_datamodel/sec_dm_main_tables/ssec_dm_gaia_source.html">the documentation</a>  of this table and choose a column that looks interesting to you.  Add the column name to the query and run it again.  What are the units of the column you selected?  What is its data type?</p>
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 <div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Solution</span>
 
@@ -1091,7 +1091,7 @@ The modified query should fail, but notice that you don’t get much useful debu
 <li><p>While you are debugging, use <code class="docutils literal notranslate"><span class="pre">TOP</span></code> to limit the number of rows in the result.  That will make each test run faster, which reduces your development time.</p></li>
 <li><p>Launching test queries synchronously might make them start faster, too.</p></li>
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 <div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Solution</span>