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.

Tested: Built the repo
Change-Id: I4fb378699d436e0c41adf80978f7cdaec12c6404
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/image_verify.hpp b/image_verify.hpp
index 5b590f4..f2387c7 100644
--- a/image_verify.hpp
+++ b/image_verify.hpp
@@ -148,7 +148,7 @@
   private:
     /**
      * @brief Function used for system level file signature validation
-     *        of image specfic publickey file and manifest file
+     *        of image specific publickey file and manifest file
      *        using the available public keys and hash functions
      *        in the system.
      *        Refer code-update documenation for more details.