Update env_var.md

trigger build

docs/faq/env_var.md

@@ -80,17 +80,20 @@ $env:MXNET_STORAGE_FALLBACK_LOG_VERBOSE=0
 * MXNET_GPU_MEM_POOL_RESERVE
   - Values: Int ```(default=5)```
   - The percentage of GPU memory to reserve for things other than the GPU array, such as kernel launch or cudnn handle space.
-  - If you see a strange out-of-memory error from the kernel launch, after multiple iterations, try setting this to a larger value.  
+  - If you see a strange out-of-memory error from the kernel launch, after multiple iterations, try setting this to a larger value.
+
 * MXNET_GPU_MEM_POOL_TYPE
   - Values: String ```(default=Naive)```
   - The type of memory pool.
   - Choices:
     - Naive: A simple memory pool that allocates memory for the exact requested size and cache memory buffers. If a buffered memory chunk matches the size of a new request, the chunk from the memory pool will be returned and reused.
     - Round: A memory pool that always rounds the requested memory size and allocates memory of the rounded size. MXNET_GPU_MEM_POOL_ROUND_LINEAR_CUTOFF defines how to round up a memory size. Caching and allocating buffered memory works in the same way as the naive memory pool.
     - Unpooled: No memory pool is used.
+
 * MXNET_GPU_MEM_POOL_ROUND_LINEAR_CUTOFF
   - Values: Int ```(default=24)```
   - The cutoff threshold that decides the rounding strategy. Let's denote the threshold as T. If the memory size is smaller than `2 ** T` (by default, it's 2 ** 24 = 16MB), it rounds to the smallest `2 ** n` that is larger than the requested memory size; if the memory size is larger than `2 ** T`, it rounds to the next k * 2 ** T.
+
 * MXNET_GPU_MEM_LARGE_ALLOC_ROUND_SIZE
   - Values: Int ```(default=2097152)```
   - When using the naive pool type, memory allocations larger than this threshhold are rounded up to a multiple of this value.