Instruct curl to follow redirects for census.gov URLs

These examples are no longer working without the addition of `-L` to the `curl` command. Note that other examples in this same file already have the `-L` for `census.gov` URLs.

Example for URL being called:
```
> curl -I http://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/California/ca2010.pl.zip

HTTP/1.1 302 Moved Temporarily
Location: https://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/California/ca2010.pl.zip?sec_ak_reference=18.440ad717.1589950562.829e1048
Server: BigIP
Content-Length: 0
Date: Wed, 20 May 2020 04:56:02 GMT
Connection: keep-alive
```
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Jamie Alessio 2020-05-19 21:57:28 -07:00 committed by GitHub
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@ -792,7 +792,7 @@ Example
Imagine you have a tileset of census blocks:
```sh
curl -O http://www2.census.gov/geo/tiger/TIGER2010/TABBLOCK/2010/tl_2010_06001_tabblock10.zip
curl -L -O http://www2.census.gov/geo/tiger/TIGER2010/TABBLOCK/2010/tl_2010_06001_tabblock10.zip
unzip tl_2010_06001_tabblock10.zip
ogr2ogr -f GeoJSON tl_2010_06001_tabblock10.json tl_2010_06001_tabblock10.shp
./tippecanoe -o tl_2010_06001_tabblock10.mbtiles tl_2010_06001_tabblock10.json
@ -801,7 +801,7 @@ ogr2ogr -f GeoJSON tl_2010_06001_tabblock10.json tl_2010_06001_tabblock10.shp
and a CSV of their populations:
```sh
curl -O http://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/California/ca2010.pl.zip
curl -L -O http://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/California/ca2010.pl.zip
unzip -p ca2010.pl.zip cageo2010.pl |
awk 'BEGIN {
print "GEOID10,population"