Fix dead links

Author: woodsp-ibm

qiskit/finance/data_providers/data_on_demand_provider.py

@@ -32,7 +32,7 @@ class DataOnDemandProvider(BaseDataProvider):
     """NASDAQ Data on Demand data provider.
 
     Please see:
-    https://github.com/Qiskit/qiskit-tutorials/qiskit/finance/data_providers/time_series.ipynb
+    https://github.com/Qiskit/qiskit-tutorials/blob/stable/0.14.x/qiskit/advanced/aqua/finance/data_providers/time_series.ipynb
     for instructions on use, which involve obtaining a NASDAQ DOD access token.
     """
 

qiskit/finance/data_providers/exchange_data_provider.py

@@ -29,7 +29,7 @@ class ExchangeDataProvider(BaseDataProvider):
     """Exchange data provider.
 
     Please see:
-    https://github.com/Qiskit/qiskit-tutorials/qiskit/finance/data_providers/time_series.ipynb
+    https://github.com/Qiskit/qiskit-tutorials/blob/stable/0.14.x/qiskit/advanced/aqua/finance/data_providers/time_series.ipynb
     for instructions on use, which involve obtaining a Quandl access token.
     """
 

qiskit/finance/data_providers/wikipedia_data_provider.py

@@ -32,7 +32,7 @@ class WikipediaDataProvider(BaseDataProvider):
     """Wikipedia data provider.
 
     Please see:
-    https://github.com/Qiskit/qiskit-tutorials/qiskit/finance/data_providers/time_series.ipynb
+    https://github.com/Qiskit/qiskit-tutorials/blob/stable/0.14.x/qiskit/advanced/aqua/finance/data_providers/time_series.ipynb
     for instructions on use.
     """