Update READMEs with VADJ info for ad7134_fmc

Author: mandrica

projects/ad7134_fmc/README.md

@@ -3,6 +3,7 @@
 - Evaluation board product page: [EVAL-AD7134-FMCZ](https://www.analog.com/eval-ad7134fmcz)
 - System documentation: https://wiki.analog.com/resources/eval/user-guides/ad713x/hdl
 - HDL project documentation: https://analogdevicesinc.github.io/hdl/projects/ad7134_fmc/index.html
+- Evaluation board for VADJ: 1.8V
 
 ## Supported parts
 

projects/ad7134_fmc/zed/README.md

@@ -1,5 +1,9 @@
+<!-- no_build_example, no_dts -->
+
 # AD7134-FMC/ZED HDL Project
 
+- VADJ with which it was tested in hardware: 1.8V
+
 ## Building the project
 
 ```