DOC: clarify the CSV format
Indicate that the text cells in the CSV format may contain quotes to
escape ambiguous texts. We don't have this case right now since we limit
the output, but it may happen in the future.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 670dfee..7b50803 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -12926,7 +12926,15 @@
---------------
The statistics may be consulted either from the unix socket or from the HTTP
-page. Both means provide a CSV format whose fields follow.
+page. Both means provide a CSV format whose fields follow. The first line
+begins with a sharp ('#') and has one word per comma-delimited field which
+represents the title of the column. All other lines starting at the second one
+use a classical CSV format using a comma as the delimiter, and the double quote
+('"') as an optional text delimiter, but only if the enclosed text is ambiguous
+(if it contains a quote or a comma). The double-quote character ('"') in the
+text is doubled ('""'), which is the format that most tools recognize. Please
+do not insert any column before these ones in order not to break tools which
+use hard-coded column positions.
0. pxname: proxy name
1. svname: service name (FRONTEND for frontend, BACKEND for backend, any name