**Apache Airflow version**: 1.10.11

**Environment**: Python 3.7

- **Cloud provider or hardware configuration**:
- **OS** (e.g. from /etc/os-release): PRETTY_NAME="Debian GNU/Linux 10 (buster)"
 (from python3.7-slim-buster docker image)
- **Kernel** (e.g. `uname -a`): Linux 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 GNU/Linux
- **Install tools**:
- **Others**:

**What happened**:

Using a markdown formatted table does not work.

**What you expected to happen**:

To be able to see a formated table within DAG view

**How to reproduce it**:

Add a tabular formatted code do dag.doc_md.

Example:

> mytable:
> 
> | a | b | c |
> | ------------- | ------------- | ------------- |
> | a | b | c |

[Table not formatted](https://i.imgur.com/l6JXuWe.png)

**Anything else we need to know**: N/A

airflow/www/utils.py
'passwd',
    'authorization',
    'api_key',
    'apikey',
    'access_token',
]
def get_sensitive_variables_fields():
    """Get comma-separated sensitive Variable Fields from airflow.cfg."""
    sensitive_fields = set(DEFAULT_SENSITIVE_VARIABLE_FIELDS)
    sensitive_variable_fields = conf.get('admin', 'sensitive_variable_fields')
    if sensitive_variable_fields:
        sensitive_fields.update({field.strip() for field in sensitive_variable_fields.split(',')})
    return sensitive_fields
def should_hide_value_for_key(key_name):
    """Returns True if hide_sensitive_variable_fields is True, else False"""
    
    if key_name:
        config_set = conf.getboolean('admin', 'hide_sensitive_variable_fields')
        field_comp = any(s in key_name.strip().lower() for s in get_sensitive_variables_fields())
        return config_set and field_comp
    return False
def get_params(**kwargs):
    """Return URL-encoded params"""
    return urlencode({d: v for d, v in kwargs.items() if v is not None})
def generate_pages(current_page, num_of_pages, search=None, status=None, window=7):
    """
    Generates the HTML for a paging component using a similar logic to the paging
    auto-generated by Flask managed views. The paging component defines a number of
    pages visible in the pager (window) and once the user goes to a page beyond the
    largest visible, it would scroll to the right the page numbers and keeps the