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: I3c06c9b99b9cf27720616e51c4cbbd3d9bdf396e
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/lib/data_proc.tcl b/lib/data_proc.tcl
index 0034c77..0e88ab7 100755
--- a/lib/data_proc.tcl
+++ b/lib/data_proc.tcl
@@ -182,7 +182,7 @@
 
   # Read properties files and return key/value pairs as a list.
 
-  # Description of arguement(s):
+  # Description of argument(s):
   # parm_file_path                  The path to the properties file.
 
   # The properties file must have the following format:
@@ -247,7 +247,7 @@
   # and put the resulting array in target_arr. If this function fails for any
   # reason, it will return non-zero
 
-  # Description of arguement(s):
+  # Description of argument(s):
   # source_arr                      The source array that is to be converted.
   # target_arr                      The target array that results from the
   #                                 conversion.
@@ -325,7 +325,7 @@
   # Call upon the shell to expand the string in "buffer", i.e. the shell will
   # make substitutions for environment variables and glob expressions.
 
-  # Description of arguement(s):
+  # Description of argument(s):
   # buffer                          The buffer to be expanded.
 
   # This is done to keep echo from interpreting all of the double quotes away.
@@ -347,7 +347,7 @@
   # Add the add string to the end of the buffer if and only if it doesn't
   # already end with the add_string.
 
-  # Description of arguement(s):
+  # Description of argument(s):
   # buffer                          The buffer to be modified.
   # add_string                      The string to conditionally append to the
   #                                 buffer.