perf chapter: fix link, add release history entry

Author: doyougnu

index.rst

@@ -26,6 +26,10 @@ by `Input Output Global <https://iohk.io/>`_.
 Release History
 ---------------
 
+* April, 2024
+
+  * :ref:`Linux Perf <Perf Chapter>` first draft finished.
+
 * February, 2024
 
   * :ref:`How to Debug <How To Debug chapter>` first draft finished.

src/Measurement_Observation/Binary_Profiling/linux_perf.rst

@@ -918,7 +918,7 @@ Helpful One Liners
 
 The most robust list is given by `Brendan Gregg <https://www.brendangregg.com/perf.html#OneLiners>`__.
 
-#. Visualizing with `speedscope<https://www.speedscope.app/>`__. Speedscope
+#. Visualizing with `speedscope <https://www.speedscope.app/>`__. Speedscope
    directly `supports
    <https://github.com/jlfwong/speedscope/wiki/Importing-from-perf-(linux)>`__
    perf. You can drop your ``perf.data`` directly into the web app or if you