correct spelling

Author: GitHubber17

docs/profiling/how-to-specify-pre-and-post-instrument-commands.md

@@ -23,7 +23,7 @@ You can specify commands that run before or after the binaries in a performance
 
 You can specify commands for all instrumented binaries in the profiling run or for individual binaries. However, you can specify only one pre-instrument command to run before and only one post-instrument command to run after the instrumentation process. You cannot specify commands for both all binaries and for individual binaries. When you specify commands for all binaries, the commands are run before or after the instrumentation of each binary in the session.
 
-The working directory in which the commands are executed depends on the operating systen  where you are running [!INCLUDE[vs_current_short](../code-quality/includes/vs_current_short_md.md)] and on the target platform of the profiled application.
+The working directory in which the commands are executed depends on the operating system where you are running [!INCLUDE[vs_current_short](../code-quality/includes/vs_current_short_md.md)] and on the target platform of the profiled application.
 
 To get the path to the profiling tools, see [Specify the path to command line tools](../profiling/specifying-the-path-to-profiling-tools-command-line-tools.md).
 
@@ -67,4 +67,4 @@ To get the path to the profiling tools, see [Specify the path to command line to
 
 ## See also
 
-[Configure performance sessions](../profiling/configuring-performance-sessions.md)
+[Configure performance sessions](../profiling/configuring-performance-sessions.md)