Small text changes.

inst/doc/dataRetrieval.Rnw

@@ -276,7 +276,7 @@ Table \ref{tab:func} describes the functions available in the dataRetrieval pack
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 In this section, examples of Web retrievals document how to get raw data. This data includes site information (\ref{sec:usgsSite}), measured parameter information (\ref{sec:usgsParams}), historical daily values(\ref{sec:usgsDaily}), unit values (which include real-time data but can also include other sensor data stored at regular time intervals) (\ref{sec:usgsRT}), water quality data (\ref{sec:usgsWQP}), groundwater level data (\ref{sec:gwl}), peak flow data (\ref{sec:peak}), rating curve data (\ref{sec:rating}, and surface-water measurement data (\ref{sec:meas}). Section \ref{sec:metadata} shows instructions for getting metadata that is attached to each returned data frame.
 
-The USGS organizes hydrologic data in a standard structure.  Streamgages are located throughout the United States, and each streamgage has a unique ID (referred in this document and throughout the dataRetrieval package as \enquote{siteNumber}).  Often (but not always), these ID's are 8 digits for streamgages, and 15 digits for groundwater gages.  The first step to finding data is discovering this siteNumber. There are many ways to do this, one is the National Water Information System: Mapper \url{http://maps.waterdata.usgs.gov/mapper/index.html}.
+The USGS organizes hydrologic data in a standard structure.  Streamgages are located throughout the United States, and each streamgage has a unique ID (referred in this document and throughout the dataRetrieval package as \enquote{siteNumber}).  Often (but not always), these ID's are 8 digits for surface-water sites and 15 digits for groundwater sites.  The first step to finding data is discovering this siteNumber. There are many ways to do this, one is the National Water Information System: Mapper \url{http://maps.waterdata.usgs.gov/mapper/index.html}.
 
 Once the siteNumber is known, the next required input for USGS data retrievals is the \enquote{parameter code}.  This is a 5-digit code that specifies the measured parameter being requested.  For example, parameter code 00631 represents \enquote{Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen}, with units of \enquote{mg/l as N}. 
 

vignettes/dataRetrieval.Rnw

@@ -276,7 +276,7 @@ Table \ref{tab:func} describes the functions available in the dataRetrieval pack
 %------------------------------------------------------------ 
 In this section, examples of Web retrievals document how to get raw data. This data includes site information (\ref{sec:usgsSite}), measured parameter information (\ref{sec:usgsParams}), historical daily values(\ref{sec:usgsDaily}), unit values (which include real-time data but can also include other sensor data stored at regular time intervals) (\ref{sec:usgsRT}), water quality data (\ref{sec:usgsWQP}), groundwater level data (\ref{sec:gwl}), peak flow data (\ref{sec:peak}), rating curve data (\ref{sec:rating}, and surface-water measurement data (\ref{sec:meas}). Section \ref{sec:metadata} shows instructions for getting metadata that is attached to each returned data frame.
 
-The USGS organizes hydrologic data in a standard structure.  Streamgages are located throughout the United States, and each streamgage has a unique ID (referred in this document and throughout the dataRetrieval package as \enquote{siteNumber}).  Often (but not always), these ID's are 8 digits for streamgages, and 15 digits for groundwater gages.  The first step to finding data is discovering this siteNumber. There are many ways to do this, one is the National Water Information System: Mapper \url{http://maps.waterdata.usgs.gov/mapper/index.html}.
+The USGS organizes hydrologic data in a standard structure.  Streamgages are located throughout the United States, and each streamgage has a unique ID (referred in this document and throughout the dataRetrieval package as \enquote{siteNumber}).  Often (but not always), these ID's are 8 digits for surface-water sites and 15 digits for groundwater sites.  The first step to finding data is discovering this siteNumber. There are many ways to do this, one is the National Water Information System: Mapper \url{http://maps.waterdata.usgs.gov/mapper/index.html}.
 
 Once the siteNumber is known, the next required input for USGS data retrievals is the \enquote{parameter code}.  This is a 5-digit code that specifies the measured parameter being requested.  For example, parameter code 00631 represents \enquote{Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen}, with units of \enquote{mg/l as N}.