Revert README cleanups.

src/backend/optimizer/README

-$PostgreSQL: pgsql/src/backend/optimizer/README,v 1.44 2008/04/09 00:55:30 momjian Exp $
+$PostgreSQL: pgsql/src/backend/optimizer/README,v 1.45 2008/04/09 00:59:24 momjian Exp $
 
 Optimizer
 =========
@@ -73,8 +73,8 @@ tree is found by a recursive process:
 
 1) Take each base relation in the query, and make a RelOptInfo structure
 for it.  Find each potentially useful way of accessing the relation,
-including sequential and index scans, and make Paths representing those
-ways.  All the Paths made for a given relation are placed in its
+including sequential and index scans, and make a Path representing that
+way.  All the Paths made for a given relation are placed in its
 RelOptInfo.pathlist.  (Actually, we discard Paths that are obviously
 inferior alternatives before they ever get into the pathlist --- what
 ends up in the pathlist is the cheapest way of generating each potentially
@@ -271,7 +271,7 @@ The primary entry point is planner().
 
 planner()
  set up for recursive handling of subqueries
- do final cleanup after planning
+ do final cleanup after planning.
 -subquery_planner()
  pull up subqueries from rangetable, if possible
  canonicalize qual

src/backend/parser/README

-$PostgreSQL: pgsql/src/backend/parser/README,v 1.8 2008/04/09 00:55:30 momjian Exp $
+$PostgreSQL: pgsql/src/backend/parser/README,v 1.9 2008/04/09 00:59:24 momjian Exp $
 
 Parser
 ======
@@ -14,7 +14,7 @@ keywords.c	turn keywords into specific tokens
 gram.y		parse the tokens and fill query-type-specific structures
 analyze.c	top level of parse analysis for optimizable queries
 parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
-parse_coerce.c	handle coercing expressions to different data types
+parse_coerce.c	handle coercing expressions to different types
 parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
 parse_oper.c	handle operators in expressions
 parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
@@ -22,5 +22,5 @@ parse_func.c	handle functions, table.column and column identifiers
 parse_node.c	create nodes for various structures
 parse_target.c	handle the result list of the query
 parse_relation.c support routines for tables and column handling
-parse_type.c	support routines for data type handling
+parse_type.c	support routines for type handling
 parse_utilcmd.c	parse analysis for utility commands (done at execution time)

src/backend/utils/mmgr/README

-$PostgreSQL: pgsql/src/backend/utils/mmgr/README,v 1.13 2008/04/09 00:55:30 momjian Exp $
+$PostgreSQL: pgsql/src/backend/utils/mmgr/README,v 1.14 2008/04/09 00:59:24 momjian Exp $
 
 Notes About Memory Allocation Redesign
 ======================================
 
 Up through version 7.0, Postgres had serious problems with memory leakage
 during large queries that process a lot of pass-by-reference data.  There
-was no provision for recycling memory until end of query.  This needed to be
-fixed, even more so with the advent of TOAST which will allowed very large
+was no provision for recycling memory until end of query.  This needs to be
+fixed, even more so with the advent of TOAST which will allow very large
 chunks of data to be passed around in the system.  This document describes
-the new memory management system implemented in 7.1.
+the new memory management plan implemented in 7.1.
 
 
 Background