Small improvements to documentation

README

@@ -22,4 +22,7 @@ Building the software
 Just run "make". To see more targets, run "make help". You may also run make in
 the individual directories.
 
+```shell
+autoconf
 ./configure --host arm-none-eabihf CFLAGS=-specs /usr/local/arm-none-eabihf/lib/atsamx70x21_flash.specs --disable-am335x --enable-embedded --disable-test --disable-ethercat --disable-vesp
+```

common/README

@@ -7,6 +7,9 @@ Directories:
 Programs:
 
 	trace_dump	Dump trace data to stdout.
+			[host] [port] [trace] <interval>
+			- [stdin]
 	
 	trace_fft	View the spectrum of a trace.
+			[trace] [interval]