MINOR: config: make strict limits enabled by default

as agreed a few months ago, enable strict-limits for v2.3
update configuration manual accordingly

Signed-off-by: William Dauchy <w.dauchy@criteo.com>
diff --git a/doc/configuration.txt b/doc/configuration.txt
index b1711b2..73bb2f4 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -1581,12 +1581,11 @@
   with USE_WURFL=1.
 
 strict-limits
-  Makes process fail at startup when a setrlimit fails. Haproxy is tries to set
-  the best setrlimit according to what has been calculated. If it fails, it
-  will emit a warning. Use this option if you want an explicit failure of
-  haproxy when those limits fail. This option is disabled by default. If it has
-  been enabled, it may still be forcibly disabled by prefixing it with the "no"
-  keyword.
+  Makes process fail at startup when a setrlimit fails. Haproxy tries to set the
+  best setrlimit according to what has been calculated. If it fails, it will
+  emit a warning. This option is here to guarantee an explicit failure of
+  haproxy when those limits fail. It is enabled by default. It may still be
+  forcibly disabled by prefixing it with the "no" keyword.
 
 3.2. Performance tuning
 -----------------------