Marc-André Lureau authored Jan 18, 2019 and Frediano Ziglio committed Feb 13, 2019

Escape special characters with \, fixes:
html/SpiceUsbDeviceManager.html:741: warning: no link for: "1" -> (<code class="literal">1</code>).
html/SpiceUsbDeviceManager.html:742: warning: no link for: "2" -> (<code class="literal">2</code>).
html/SpiceUsbDeviceManager.html:743: warning: no link for: "3" -> (<code class="literal">3</code>).
html/SpiceUsbDeviceManager.html:744: warning: no link for: "4" -> (<code class="literal">4</code>).
html/SpiceUsbDeviceManager.html:745: warning: no link for: "5" -> (<code class="literal">5</code>).
html/SpiceUsbDeviceManager.html:747: warning: no link for: "s" -> (<code class="literal">s</code>).
html/SpiceUsbDeviceManager.html:747: warning: no link for: "d" -> (<code class="literal">d</code>).
html/SpiceInputsChannel.html:697: warning: no link for: "0xe0" -> (<code class="literal">0xe0</code>).
html/SpiceInputsChannel.html:698: warning: no link for: "0x100" -> (<code class="literal">0x100</code>).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>