regression: adjust polygon diagrams to not use tabs

Also, small diagram adjustments

Patch by Emre Hasegeli

src/test/regress/expected/polygon.out

@@ -7,8 +7,8 @@
 --            |
 -- 2        + |
 --         /  |
--- 1	  # o +
---       /    |
+-- 1      #   +
+--       /  o |
 -- 0    #-----o-+
 --
 --      0 1 2 3 4
@@ -129,7 +129,7 @@ SELECT '' AS one, p.*
 -- polygon logic
 --
 -- 3          o
---	      |
+--           /|
 -- 2        + |
 --         /  |
 -- 1      / o +
@@ -138,6 +138,7 @@ SELECT '' AS one, p.*
 --
 --      0 1 2 3 4
 --
+--
 -- left of
 SELECT polygon '(2.0,0.0),(2.0,4.0),(0.0,0.0)' << polygon '(3.0,1.0),(3.0,3.0),(1.0,0.0)' AS false;
  false 

src/test/regress/sql/polygon.sql

@@ -7,8 +7,8 @@
 --            |
 -- 2        + |
 --         /  |
--- 1	  # o +
---       /    |
+-- 1      #   +
+--       /  o |
 -- 0    #-----o-+
 --
 --      0 1 2 3 4
@@ -84,7 +84,7 @@ SELECT '' AS one, p.*
 -- polygon logic
 --
 -- 3          o
---	      |
+--           /|
 -- 2        + |
 --         /  |
 -- 1      / o +
@@ -93,6 +93,7 @@ SELECT '' AS one, p.*
 --
 --      0 1 2 3 4
 --
+--
 -- left of
 SELECT polygon '(2.0,0.0),(2.0,4.0),(0.0,0.0)' << polygon '(3.0,1.0),(3.0,3.0),(1.0,0.0)' AS false;