removed doubled text

README.md

@@ -90,7 +90,7 @@ pandas `DataFrame`) of `IDCClient`. Additional index tables such as the
 `clinical_index` contain non-DICOM clinical data or slide microscopy specific
 tables (indicated by the prefix `sm`) include metadata attributes specific to
 slide microscopy images. A description of available attributes for all indices
-can be found [here](./docs/column_descriptions.html).
+can be found [here](./docs/column_descriptions).
 
 ## Tutorial
 

docs/column_descriptions.md

@@ -1,11 +1,3 @@
-`idc-index` is named this way because it wraps indices of IDC data: tables
-containing the most important metadata attributes describing the files available
-in IDC. The main metadata index is available in the `index` variable (which is a
-pandas `DataFrame`) of `IDCClient`. Additional index tables such as the
-`clinical_index` contain non-DICOM clinical data or slide microscopy specific
-tables (indicated by the prefix `sm`) include metadata attributes specific to
-slide microscopy images.
-
 The following is the list of the columns included in `index`. You can use those
 to select cohorts and subsetting data. `idc-index` is series-based, i.e, it has
 one row per DICOM series.