fix: fix a typo in about.

Author: CptGit

_includes/about.html

@@ -8,7 +8,7 @@ <h2>About</h2>
     I obtained my Ph.D. at
     <a href="https://www.utexas.edu/">The University of Texas at Austin</a> in 2024,
     working with Prof. <a href="https://users.ece.utexas.edu/~gligoric/">Milos
-      Gligoric</a>. See my diseertation
+      Gligoric</a>. See my dissertation
     <a href="/dl/papers/zang24dissertation.pdf" >here</a>.
     My research interests are JIT (Just-In-Time) compiler testing and
     optimization. I am also familiar with other software engineering