fix indent on old history lines

Author: book

pod/perlhist.pod

@@ -206,11 +206,11 @@ the strings?).
  Andy     5.002gamma    1996-Feb-11
  Larry    5.002delta    1996-Feb-27
 
- Larry   5.002          1996-Feb-29     Prototypes.
+ Larry    5.002         1996-Feb-29     Prototypes.
 
  Charles  5.002_01      1996-Mar-25
 
-         5.003          1996-Jun-25     Security release.
+          5.003         1996-Jun-25     Security release.
 
           5.003_01      1996-Jul-31
  Nick     5.003_02      1996-Aug-10
@@ -264,7 +264,7 @@ the strings?).
           p54rc1        1997-May-12     Release Candidates.
           p54rc2        1997-May-14
 
- Chip    5.004          1997-May-15     A major maintenance release.
+ Chip     5.004         1997-May-15     A major maintenance release.
 
  Tim      5.004_01-t1   1997-???-??     The 5.004 maintenance track.
           5.004_01-t2   1997-Jun-11     aka perl5.004m1t2