LimeSDR: updated GUI documentation

plugins/samplesink/limesdroutput/readme.md

@@ -127,4 +127,8 @@ This is the stream throughput in MB/s and is usually about 3 times the sample ra
 
 <h3>19: FIFO status</h3>
 
-This is the fill percentage of the Tx FIFO in the LimeSuite interface. In normal conditions this should be ~100%. On the picture the Tx is not started.
+This is the fill percentage of the Tx FIFO in the LimeSuite interface. In normal conditions this should be ~100%. On the picture the Tx is not started.
+
+<h3>20: Board temperature</h3>
+
+This is the board temperature in degrees Celsius updated every ~5s. Before the first probe the display marks "00C" this is normal.

plugins/samplesource/limesdrinput/readme.md

@@ -145,4 +145,8 @@ This is the stream throughput in MB/s and is usually about 3 times the sample ra
 
 <h3>19: FIFO status</h3>
 
-This is the fill percentage of the Rx FIFO in the LimeSuite interface. It should be zero most of the time.
+This is the fill percentage of the Rx FIFO in the LimeSuite interface. It should be zero most of the time.
+
+<h3>20: Board temperature</h3>
+
+This is the board temperature in degrees Celsius updated every ~5s. Before the first probe the display marks "00C" this is normal.