Fixed up some spelling

README.md

@@ -172,7 +172,7 @@ This test will:
 * Set the response Content-Type to application/json.
 * Serialize the row to JSON and send the resulting string as the response.
 
-By convnetion, if the test does not use an ORM, and instead uses the raw database connectivity provided by the platform (e.g., JDBC), we append a "-raw" to the test name in the [benchmark_config](#the-benchmark_config-file) file.  For example, "php-raw".
+By convention, if the test does not use an ORM, and instead uses the raw database connectivity provided by the platform (e.g., JDBC), we append a "-raw" to the test name in the [benchmark_config](#the-benchmark_config-file) file.  For example, "php-raw".
 
 Pseudo-code:
 
@@ -279,4 +279,4 @@ The setup file is a python file that contains a start() and a stop() function. H
       subprocess.check_call("$RESIN_HOME/bin/resinctl shutdown", shell=True)
       return 0
     except subprocess.CalledProcessError:
-      return 1
+      return 1