Add TVOC in Linux Air Quality Example README (#32517)

* Add TVOC in Linux Air Quality Example README

Add TVOC in Linux Air Quality Example README

* Update .wordlist.txt to add 'TVOC'
diff --git a/.github/.wordlist.txt b/.github/.wordlist.txt
index 2170884..018ed26 100644
--- a/.github/.wordlist.txt
+++ b/.github/.wordlist.txt
@@ -1440,6 +1440,7 @@
 ttyUSB
 TurbidityConcentrationMeasurement
 TvCasting
+TVOC
 tvOS
 TXD
 txt
diff --git a/examples/air-quality-sensor-app/linux/README.md b/examples/air-quality-sensor-app/linux/README.md
index 38a0adf..651afa4 100644
--- a/examples/air-quality-sensor-app/linux/README.md
+++ b/examples/air-quality-sensor-app/linux/README.md
@@ -183,3 +183,10 @@
 ```
 echo '{"Name":"Pm10ConcentrationMeasurement","NewValue":10}' > /tmp/chip_air_quality_fifo_<PID>
 ```
+
+Generate event `TotalVolatileOrganicCompoundsConcentrationMeasurement`, to
+change the TVOC value.
+
+```
+$ echo '{"Name":"TotalVolatileOrganicCompoundsConcentrationMeasurement","NewValue":100}' > /tmp/chip_air_quality_fifo_<PID>
+```