Codespell 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: I2cf277da6cc16322eff8adaba83e1ea98dd4cb41
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/bin/select_version b/bin/select_version
index 0eb8f47..ff09003 100755
--- a/bin/select_version
+++ b/bin/select_version
@@ -17,7 +17,7 @@
 
 # If <program name>_VERSION is blank or not set, then the program version
 # will be whatever the system default program version is.  If <program
-# name>_VERSION is set to a value, then that value will be appened to the name
+# name>_VERSION is set to a value, then that value will be appended to the name
 # of the program (e.g. if PYTHON_VERSION = "3", then python3 will be used.).
 # If <program name>_VERSION is set to some value that does not correspond to a
 # valid program version for the given system, this program will fail.