Update README.Rmd

Fixes typos.

README.Rmd

@@ -17,7 +17,7 @@ Several major changes have been made to `elevatr` in response to the retirement
 # elevatr
 An R package for accessing elevation data from various sources
 
-The `elevatr` package currently provides access to elevation data from AWS Open Data [Terrain Tiles](https://registry.opendata.aws/terrain-tiles/) and the Open Topography [Global datasets API](https://opentopography.org/developers#API) for raster digital elevation models.  For point elevation data,the [USGS Elevation Point Query Service](https://apps.nationalmap.gov/epqs/)) may be used or the point elevations may be derived from the AWS Tiles. Additional elevation data sources may be added as they come available.
+The `elevatr` package currently provides access to elevation data from AWS Open Data [Terrain Tiles](https://registry.opendata.aws/terrain-tiles/) and the Open Topography [Global datasets API](https://opentopography.org/developers#API) for raster digital elevation models.  For point elevation data, the [USGS Elevation Point Query Service](https://apps.nationalmap.gov/epqs/) may be used or the point elevations may be derived from the AWS Tiles. Additional elevation data sources may be added as they come available.
 
 Currently this package includes just two primary functions to access elevation web services:
 
@@ -50,10 +50,10 @@ As `elevatr` is getting more widely used, there have been some great contributio
 
 ## Attribution
 
-Mapzen terrain tiles (which supply the AWS source) contain 3DEP, SRTM, and GMTED2010 content courtesy of the U.S. Geological Survey and ETOPO1 content courtesy of U.S. National Oceanic and Atmospheric Administration. The Open Topography API provide access to the SRTM and the ALOS World 3D datasets.  See <https://opentopography.org/> for details.  
+Mapzen terrain tiles (which supply the AWS source) contain 3DEP, SRTM, and GMTED2010 content courtesy of the U.S. Geological Survey and ETOPO1 content courtesy of U.S. National Oceanic and Atmospheric Administration. The Open Topography API provide access to the SRTM and the ALOS World 3D datasets. See <https://opentopography.org/> for details.  
 
 ## Repositories
 The source code for this repository is maintained at https://github.com/jhollist/elevatr which is also mirrored at https://github.com/usepa/elevatr
 
 ## EPA Disclaimer
-The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity , confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.
+The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.