Fixed a typo in the spec for round_zeros

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402309

dlib/matrix/matrix_math_functions_abstract.h

@@ -246,7 +246,7 @@ namespace dlib
                 - R has the same dimensions as m
                 - let eps == 10*std::numeric_limits<matrix_exp::type>::epsilon()
                 - for all valid r and c:
-                    - if (m(r,c) >= eps || m(r,c) <= eps) then
+                    - if (abs(m(r,c)) >= eps) then
                         - R(r,c) == m(r,c)
                     - else
                         - R(r,c) == 0
@@ -266,7 +266,7 @@ namespace dlib
                 - R::type == the same type that was in m
                 - R has the same dimensions as m
                 - for all valid r and c:
-                    - if (m(r,c) >= eps || m(r,c) <= eps) then
+                    - if (abs(m(r,c)) >= eps) then
                         - R(r,c) == m(r,c)
                     - else
                         - R(r,c) == 0