fixed typo in equation

content/input_pk.html

@@ -62,7 +62,7 @@ describe the plasma concentration as a function of time:</p>
 <a name="eq_biexp"></a>
 <div class="eqs">
 <script type="math/tex; mode=display">
-  {CL}_{P}(t) = A e^{-k_{\alpha} t} + B e^{-k_{\beta} t}
+  {C}_{P}(t) = A e^{-k_{\alpha} t} + B e^{-k_{\beta} t}
 </script>
 </div>