Doxygen configuration clean up

docs/Doxyfile

@@ -1,3 +1,18 @@
+# This is Doxygen configuration file
+#
+# Doxygen provides over 260 configuration statements
+# To make this file easier to follow, 
+# it contains only statements that are non-default
+#
+# NOTE:
+# It is recommended not to change defaults unless specifically required
+# Test any changes how they affect generated documentation
+# Make sure that correct warnings are generated to flag issues with documented code
+#
+# For the complete list of configuration statements see:
+# http://www.stack.nl/~dimitri/doxygen/manual/config.html
+
+
 PROJECT_NAME = "ESP32 Programming Guide"
 
 INPUT = ../components/esp32/include/esp_wifi.h \
@@ -10,14 +25,18 @@ INPUT = ../components/esp32/include/esp_wifi.h \
 	../components/esp32/include/esp_int_wdt.h \
 	../components/esp32/include/esp_task_wdt.h
 
-WARN_NO_PARAMDOC	= YES
+## Get warnings for functions that have no documentation for their parameters or return value 
+##
+WARN_NO_PARAMDOC = YES
 
-RECURSIVE		= NO
-CASE_SENSE_NAMES 	= NO
-EXTRACT_ALL		= NO
+## Do not complain about not having dot
+##
+HAVE_DOT = NO
 
-GENERATE_XML		= YES
-XML_OUTPUT		= xml
+## Generate XML that is required for Breathe
+##
+GENERATE_XML = YES
+XML_OUTPUT = xml
 
 GENERATE_HTML		= NO
 HAVE_DOT		= NO
@@ -25,5 +44,9 @@ GENERATE_LATEX		= NO
 GENERATE_MAN		= YES
 GENERATE_RTF		= NO
 
+## Skip distracting progress messages
+##
+QUIET = YES
+## Log warnings in a file for further review
+##
 WARN_LOGFILE = "doxygen-warning-log.txt"
-