fix some typos in sw::Ring

introduced by
    commit d150ace12b
    Author: Bjoern Michaelsen <bjoern.michaelsen@canonical.com>
    Date:   Fri Dec 5 03:54:55 2014 +0100
    stick to code conventions for new code

Change-Id: I97b257b85fba5734c6f5dedb141c448e6d30ee46
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165058
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sw/inc/ring.hxx

@@ -144,7 +144,7 @@ namespace sw
     }
 
     /**
-     * helper class that provides Svalue_typeL-style container iteration to the ring
+     * helper class that provides STL-style container iteration to the ring
      */
     template <typename value_type>
     class SAL_WARN_UNUSED RingContainer final
@@ -226,7 +226,7 @@ namespace sw
             value_type& dereference() const
                 { return m_pCurrent ? *m_pCurrent : * m_pStart; }
             /**
-             * value_type is:
+             * This is:
              * - pointing to the current item in the iteration in general
              * - nullptr if on the first item (begin())
              * - m_pStart when beyond the last item (end())