Fix typos

Change-Id: Iba6b13871222d591bce49d04990e7c85ff154cce
Reviewed-on: https://gerrit.libreoffice.org/38915
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

include/salhelper/dynload.hxx

@@ -170,7 +170,7 @@ public:
         return (*this);
     }
 
-    /// returns a poiner to the initialized API function structure.
+    /// returns a pointer to the initialized API function structure.
     API* SAL_CALL getApi() const
     {
         return static_cast<API*>(m_pLoader->getApi());

libreofficekit/source/gtk/lokdocview.cxx

@@ -1149,7 +1149,7 @@ callback (gpointer pData)
     LOKDocViewPrivate& priv = getPrivate(pDocView);
 
     //callback registered before the widget was destroyed.
-    //Use existance of lokThreadPool as flag it was torn down
+    //Use existence of lokThreadPool as flag it was torn down
     if (!priv->lokThreadPool)
     {
         delete pCallback;