[Documentation] Format code block.

Signed-off-by: Marcela Morales Quispe <[email protected]>

Author: marcemq

ISSUE_TEMPLATE.md

@@ -29,9 +29,11 @@ You can collect some of this information using our environment capture script:
 
 https://github.com/tensorflow/tensorflow/tree/master/tools/tf_env_collect.sh
 
-You can obtain the TensorFlow version with
+You can obtain the TensorFlow version with:
 
+```bash
 python -c "import tensorflow as tf; print(tf.GIT_VERSION, tf.VERSION)"
+```
 
 ### Describe the problem
 Describe the problem clearly here. Be sure to convey here why it's a bug in TensorFlow or a feature request.