README files have changed names, better change references too :-)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@12572 65c4cc65-6c06-0410-ace0-fbb531ad65f3

doc/billing.txt

@@ -11,7 +11,7 @@ separated text file.
      for an updated list of supported databases, from MySQL to MsSQL
      and text files.
    * cdr_tds supports FreeTDS databases (Among them MS SQL)
-	NOTE: Please read README.tds for information on possible
+	NOTE: Please read doc/freetds.txt for information on possible
 	problems with the FreeTDS driver
    * cdr_sqlite supports SQlite
    * cdr_pgsql supports PostgreSQL

doc/enum.txt

@@ -1,5 +1,5 @@
-README.enum
-
+Enum support in the ENUMLOOKUP dialplan function
+------------------------------------------------
 2005-09-06 
 jtodd@loligo.com
 

doc/extconfig.txt

@@ -9,7 +9,7 @@ Asterisk's internal configuration structure and external SQL other other
 databases (maybe even LDAP one day).
 
 The external configuration engine is the basis for the ARA, the
-Asterisk Realtime Architecture (see README.realtime for more 
+Asterisk Realtime Architecture (see doc/realtime.txt for more 
 information).
 
 * Configuration

doc/realtime.txt

@@ -8,7 +8,7 @@ The benefits of this architecture are many, both from a code management
 standpoint and from an installation perspective. 
 
 Additional information on the configuration of Realtime with Asterisk 
-can be found in README.extconfig
+can be found in doc/extconfig.txt
 
 The ARA is designed to be independent of storage. Currently, most
 drivers are based on SQL, but the architecture should be able to handle
@@ -82,7 +82,7 @@ objects and the realtime switch.
 ---------------------------------
 You configure the ARA in extconfig.conf (yes, it's a strange name, but
 is was defined in the early days of the realtime architecture and kind
-of stuck). Please see README.extconfig for database schemas.
+of stuck). Please see doc/extconfig.txt for database schemas.
 
 The part of Asterisk that connects to the ARA use a well defined family
 name to find the proper database driver. The syntax is easy:
@@ -98,11 +98,10 @@ Defined well-known family names are:
 * voicemail		Voicemail accounts 
 
 There is documentation of the SQL database in the file
-README.extconfig in your Asterisk source code tree, the /doc
-directory.
+doc/extconfig.txt in your Asterisk source code tree.
 
 For voicemail storage with the support of ODBC, there is a 
-README.odbcstorage documentation file.
+doc/odbcstorage.txt documentation file.
 
 
 * FreeTDS not supported