Clarified spec

dlib/svm/svm_abstract.h

@@ -99,11 +99,9 @@ namespace dlib
               certain types of sub-sequences (e.g. proper names).
             - returns true if all of the following are true and false otherwise:
                 - is_learning_problem(samples, segments) == true
-                - for all valid i:
-                    - for all valid j:
-                        - We interpret segments[i][j] as defining a half open range
-                          starting with segments[i][j].first and ending just before
-                          segments[i][j].second.
+                - for all valid i and j:
+                    - We interpret segments[i][j] as defining a half open range starting
+                      with segments[i][j].first and ending just before segments[i][j].second.
                     - segments[i][j].first < segments[i][j].second
                     - segments[i][j].second <= samples[i].size()
                       (i.e. Each segment must be contained within its associated sequence)