message: fix typo in cmake from 70,80 to 70;80
diff: @@ -72,19 +72,19 @@ To build HugeCTR from source, do the following:
  ```shell
  $ mkdir -p build && cd build
  - $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70,80" -DVAL_MODE=ON .. # Target is NVIDIA V100 / A100 with Validation mode on.
  + $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70;80" -DVAL_MODE=ON .. # Target is NVIDIA V100 / A100 with Validation mode on.
  $ make -j && make install
  ```
  ```shell
  $ mkdir -p build && cd build
  - $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70,80" -DCMAKE_BUILD_TYPE=Debug .. # Target is NVIDIA V100 / A100 with Debug mode.
  + $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70;80" -DCMAKE_BUILD_TYPE=Debug .. # Target is NVIDIA V100 / A100 with Debug mode.
  $ make -j && make install
  ```
  ```shell
  $ mkdir -p build && cd build
  - $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70,80" -DENABLE_INFERENCE=ON .. # Target is NVIDIA V100 / A100 with Validation mode on.
  + $ cmake -DCMAKE_BUILD_TYPE=Release -DSM="70;80" -DENABLE_INFERENCE=ON .. # Target is NVIDIA V100 / A100 with Validation mode on.
  $ make -j && make install
  ```
  