apacheGH-45560: [Docs] Fix Statistics schema's "column" examples

"column" in examples have duplicated values for the same column but
"column" must have only one value for each column.

docs/source/format/StatisticsSchema.rst

@@ -314,12 +314,6 @@ Statistics array::
     column: [
       null, # record batch
       0,    # vendor_id
-      0,    # vendor_id
-      0,    # vendor_id
-      0,    # vendor_id
-      1,    # passenger_count
-      1,    # passenger_count
-      1,    # passenger_count
       1,    # passenger_count
     ]
     statistics:
@@ -491,17 +485,10 @@ Statistics array::
       null, # record batch
       0,    # col1
       1,    # col1.a
-      1,    # col1.a
-      1,    # col1.a
-      1,    # col1.a
       2,    # col1.b
       3,    # col1.b.item
-      3,    # col1.b.item
-      4,    # col1.c
-      4,    # col1.c
       4,    # col1.c
       5,    # col2
-      5,    # col2
     ]
     statistics:
       key:
@@ -642,10 +629,6 @@ Statistics array::
 
     column: [
       0, # array
-      0, # array
-      0, # array
-      0, # array
-      0, # array
     ]
     statistics:
       key:
@@ -787,17 +770,10 @@ Statistics schema::
 Statistics array::
 
     column: [
-      0, # array
       0, # array
       1, # a
-      1, # a
-      1, # a
-      1, # a
       2, # b
       3, # b.item
-      3, # b.item
-      4, # c
-      4, # c
       4, # c
     ]
     statistics: