Merge pull request #2869 from martinholmer/more-data-docs

More edits of the docs/usage/data.md documentation file

Author: martinholmer

docs/usage/data.md

@@ -61,21 +61,21 @@ file.
 
 The [tax-microdata
 repository](https://github.com/PSLmodels/tax-microdata-benchmarking)
-produces an input variables file (`tmd.csv`), a national weights file
-(`tmd_weights.csv.gz`), and a variable growth factors file
+produces an input variables file (`tmd.csv.gz`), a national weights
+file (`tmd_weights.csv.gz`), and a variable growth factors file
 (`tmd_growfactors.csv`) that can be used with the Tax-Calculator
 package beginning with the 3.6.0 release.  The TMD files are available
 only to users who have purchased their own version of the 2015 IRS-SOI
-PUF.  For those users, the three TMD files are avaiable from the
-tax-microdata repository.  These three TMD files can be used with
+PUF.  For those users, the TMD files are avaiable from the
+tax-microdata repository.  The three TMD files can be used with
 Tax-Calculator in two ways:
   - with the **Python API** by instantiating a GrowFactors object that
-    uses TMD factors [`gf = GrowFactors("path/to/tmd_growfactors.csv")`]
+    uses TMD growth factors [`gf=GrowFactors("path/to/tmd_growfactors.csv")`]
     and by using the `Records.tmd_constructor()` and
     `Policy.tmd_constructor()` static methods to instantiate a Records
     object and a Policy object, or
   - with the **CLI tool**, `tc`, when the three TMD files are all in
-    the same folder.
+    the same folder and the `tmd.csv.gz` file has been unzipped.
 
 ## Using other data with Tax-Calculator