Fix doc URLs

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>

index.html

@@ -231,17 +231,17 @@ <h2>
 
 <ul>
 <li>
-<code>rcu_</code>: Read-Copy Update (see <a href="doc/rcu-api.md"><code>doc/rcu-api.md</code></a>)</li>
+<code>rcu_</code>: Read-Copy Update (see <a href="//github.com/urcu/userspace-rcu/blob/master/doc/rcu-api.md"><code>doc/rcu-api.md</code></a>)</li>
 <li>
 <code>cmm_</code>: Concurrent Memory Model</li>
 <li>
 <code>caa_</code>: Concurrent Architecture Abstraction</li>
 <li>
 <code>cds_</code>: Concurrent Data Structures
-(see <a href="doc/cds-api.md"><code>doc/cds-api.md</code></a>)</li>
+(see <a href="//github.com/urcu/userspace-rcu/blob/master/doc/cds-api.md"><code>doc/cds-api.md</code></a>)</li>
 <li>
 <code>uatomic_</code>: Userspace Atomic
-(see <a href="doc/uatomic-api.md"><code>doc/uatomic-api.md</code></a>)</li>
+(see <a href="//github.com/urcu/userspace-rcu/blob/master/doc/uatomic-api.md"><code>doc/uatomic-api.md</code></a>)</li>
 </ul><h2>
 <a name="quick-start-guide" class="anchor" href="#quick-start-guide"><span class="octicon octicon-link"></span></a>Quick start guide</h2>
 
@@ -396,7 +396,7 @@ <h3>
 grace periods.  A number of additional functions are provided
 to manage the helper threads used by <code>call_rcu()</code>, but reasonable
 defaults are used if these additional functions are not invoked.
-See <a href="doc/rcu-api.md"><code>doc/rcu-api.md</code></a> in userspace-rcu documentation
+See <a href="//github.com/urcu/userspace-rcu/blob/master/doc/rcu-api.md"><code>doc/rcu-api.md</code></a> in userspace-rcu documentation
 for more details.</li>
 </ul><h3>
 <a name="being-careful-with-signals" class="anchor" href="#being-careful-with-signals"><span class="octicon octicon-link"></span></a>Being careful with signals</h3>