Fix code snipped now showing

Summary:
TF2.5 Only

The code snippets aren't showing because (I think) I needed to put a space between `code-block and the code itself.

T58039

Reviewers: georgep, #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, samuelh

Reviewed By: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, samuelh

Maniphest Tasks: T58039

Differential Revision: https://phabricator.sourcevertex.net/D62793

Author: victorv-vv

tensorflow/python/ipu/config.py

@@ -1520,6 +1520,7 @@ def __init__(self):
     parameter is shown below:
 
     .. code-block:: python
+
       cfg = config.IPUConfig()
       cfg.matmuls.poplar_options['partialsType'] = "half"
       cfg.configure_ipu_system()
@@ -1561,6 +1562,7 @@ def __init__(self):
     parameter is shown below:
 
     .. code-block:: python
+
       cfg = config.IPUConfig()
       cfg.convolutions.poplar_options['partialsType'] = "half"
       cfg.configure_ipu_system()