Update how-to-docs.html

Co-authored-by: Casey Carter <[email protected]>

Author: jwakely

how-to-docs.html

@@ -27,7 +27,7 @@ <h2>Prerequisites</h2>
 <ul>
   <li>Git</li>
   <li>A C++17 compiler. Clang 9 works. GCC 8.x works for unix-like systems, but GCC 9.3 is recommended (because its <code>std::filesystem</code> supports Windows, and no additional <code>-lstdc++fs</code> linker option is needed).</li>
-  <li>Windows is a prerequisite to use the Windows <code>.bat</code> scripts, or
+  <li>Windows is a prerequisite to use the Windows <code>.bat</code> scripts;
   a POSIX environment is a prerequisite to use the equivalent <code>make</code>
   commands.</li>
 </ul>