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: I13bbeeb8f1467efc1cf8748e1a66343e879dfc8a
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/bin/ssh_pw b/bin/ssh_pw
index 53ae5e9..0f7dce8 100755
--- a/bin/ssh_pw
+++ b/bin/ssh_pw
@@ -28,7 +28,7 @@
     expect {
       -re "Offending RSA key in (.*?)\[\r\n\]" {
         # We have been informed by ssh that we have a bad key.
-        # Retreive the file path and line number from the ssh output.
+        # Retrieve the file path and line number from the ssh output.
         set fields [split $expect_out(1,string) ":"]
         set file_path [lindex $fields 0]
         set line_num [lindex $fields 1]