Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: I562cc5b407fb2a3a728c6167aaab75acde3adfca
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/watch.hpp b/watch.hpp
index bbfa476..98c35c4 100644
--- a/watch.hpp
+++ b/watch.hpp
@@ -16,7 +16,7 @@
 
 namespace fs = std::experimental::filesystem;
 
-//User specfic call back function input map(path:event) type.
+//User specific call back function input map(path:event) type.
 using UserMap = std::map<fs::path, uint32_t>;
 
 //User specific callback function wrapper type.