add connection string to main

Author: lzchen

articles/azure-monitor/app/opencensus-python.md

@@ -104,7 +104,7 @@ Here are the exporters that OpenCensus provides mapped to the types of telemetry
     [SpanData(name='test', context=SpanContext(trace_id=8aa41bc469f1a705aed1bdb20c342603, span_id=None, trace_options=TraceOptions(enabled=True), tracestate=None), span_id='f3f9f9ee6db4740a', parent_span_id=None, attributes=BoundedDict({}, maxlen=32), start_time='2019-06-27T18:21:46.157732Z', end_time='2019-06-27T18:21:47.269583Z', child_span_count=0, stack_trace=None, annotations=BoundedList([], maxlen=32), message_events=BoundedList([], maxlen=128), links=BoundedList([], maxlen=32), status=None, same_process_as_parent_span=None, span_kind=0)]
     ```
 
-3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the `SpanData` to Azure Monitor. Modify your code from the previous step based on the following code sample:
+3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the `SpanData` to Azure Monitor. Pass your connection string directly into the exporter, or you can specify it in an environment variable `APPLICATIONINSIGHTS_CONNECTION_STRING`. Modify your code from the previous step based on the following code sample:
 
     ```python
     from opencensus.ext.azure.trace_exporter import AzureExporter
@@ -190,7 +190,7 @@ Here are the exporters that OpenCensus provides mapped to the types of telemetry
     Point(value=ValueLong(7), timestamp=2019-10-09 20:58:07.138614)
     ```
 
-3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the metric data to Azure Monitor. Modify your code from the previous step based on the following code sample:
+3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the metric data to Azure Monitor. Pass your connection string directly into the exporter, or you can specify it in an environment variable `APPLICATIONINSIGHTS_CONNECTION_STRING`. Modify your code from the previous step based on the following code sample:
 
     ```python
     from datetime import datetime
@@ -274,7 +274,7 @@ Here are the exporters that OpenCensus provides mapped to the types of telemetry
     90
     ```
 
-3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the log data to Azure Monitor. Modify your code from the previous step based on the following code sample:
+3. Although entering values is helpful for demonstration purposes, ultimately we want to emit the log data to Azure Monitor. Pass your connection string directly into the exporter, or you can specify it in an environment variable `APPLICATIONINSIGHTS_CONNECTION_STRING`. Modify your code from the previous step based on the following code sample:
 
     ```python
     import logging