Update ExploringISB-CGC.rst

Remove COSMIC

docs/source/sections/ExploringISB-CGC.rst

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 ISB-CGC Data Overview
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-ISB-CGC provides access to data from several research programs, such as **The Cancer Genome Atlas (TCGA)**, **Therapeutically Applicable Research to Generate Effective Treatments (TARGET)**, **Cancer Cell Line Encyclopedia (CCLE)** and **Catalogue of Somatic Mutations in Cancer (COSMIC)**. The full list is available `here <Hosted-Data.html>`_.  
+ISB-CGC provides access to data from several research programs, such as **The Cancer Genome Atlas (TCGA)**, **Therapeutically Applicable Research to Generate Effective Treatments (TARGET)**, and **Cancer Cell Line Encyclopedia (CCLE)**. The full list is available `here <Hosted-Data.html>`_.  
 
 The majority of the data made available through ISB-CGC originates from NCI `Genomic Data Commons <https://gdc.cancer.gov/>`_ (GDC). Users can access GDC data on the cloud through ISB-CGC. Users have access to both raw and processed data from cancer patients.