docs/building-examples: export FPGA_FAM

Signed-off-by: Unai Martinez-Corral <umartinezcorral@antmicro.com>

docs/building-examples.rst

@@ -20,14 +20,14 @@ Select your FPGA family:
       .. code-block:: bash
          :name: fpga-fam-xc7
 
-         FPGA_FAM="xc7"
+         export FPGA_FAM="xc7"
 
    .. group-tab:: EOS S3
 
       .. code-block:: bash
          :name: fpga-fam-eos-s3
 
-         FPGA_FAM="eos-s3"
+         export FPGA_FAM="eos-s3"
 
 Next, prepare the environment:
 

eos-s3/btn_counter/README.rst

@@ -7,6 +7,4 @@ counter example, run the following command:
 .. code-block:: bash
    :name: eos-s3-counter
 
-   #FIXME: make sure FPGA_FAM is available and remove env var export
-   export FPGA_FAM=eos-s3
    make -C btn_counter