update documentation

Author: zacharyburnett

examples/example_1.yaml

@@ -1,5 +1,6 @@
-# this configuration tells PacketRaven to read several text files containing APRS packets
-# and output information on the flight track to the console (per-callsign)
+# this configuration tells PacketRaven to perform the following functions:
+#  1. read several text files containing APRS packets
+#  2. output information to the console
 #
 # you can run this configuration with the following: `packetraven examples/example_1.yaml`
 

examples/example_2.yaml

@@ -1,7 +1,7 @@
 # this configuration tells PacketRaven to perform the following functions:
-#  1. read packet information from https://aprs.fi
-#  2. filter to specific callsigns
-#  3. log messages to a text file at `./example_2.log`
+#  1. retrieve packets from https://aprs.fi
+#  2. filter by specific callsigns
+#  3. output information to the console and to `./example_2.log`
 #
 # you can run this configuration with the following: `packetraven examples/example_2.yaml`
 

examples/example_3.yaml

@@ -4,10 +4,10 @@
 #    - a USB port at `/dev/ttyUSB0`
 #    - a text file at `~/packets.txt`
 #    - a PostGreSQL database at `bpp.umd.edu`
-#  2. filter to specific callsigns and constrain to a specific time range
+#  2. filter by specific callsigns and constrain to a specific time range
 #  3. provide CUSF prediction information with the given parameters
 #  4. output packets to a GeoJSON file at `./example_3.geojson`
-#  5. log messages to a text file at `./example_3.log`
+#  3. output information to the console and to `./example_3.log`
 #
 # you can run this configuration with the following: `packetraven examples/example_2.yaml`
 

examples/example_4.yaml

@@ -1,13 +1,10 @@
 # this configuration tells PacketRaven to perform the following functions:
-#  1. read packet information from https://aprs.fi
-#  2. log messages to a text file at `./example_4.log`
-#  3. plot altitude using `matplotlib`
+#  1. read several text files containing APRS packets
+#  2. output information to the console
+#  3. plot altitude with `matplotlib`
 #
 # you can run this configuration with the following: `packetraven examples/example_4.yaml`
 
-log:
-  filename: 'example_4.log'
-
 packets:
   text:
     locations: