Fix spelling mistakes using codespell

This commit corrects various spelling mistakes throughout the
repository. The corrections were made automatically using `codespell`[1]
tool.

[1]: https://github.com/codespell-project/codespell

Change-Id: Ia6b70713d3e9b77d6fd2d9400489ef7f02360364
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/jenkins/userid-validation b/jenkins/userid-validation
index 35b2e81..ae0e1de 100755
--- a/jenkins/userid-validation
+++ b/jenkins/userid-validation
@@ -7,7 +7,7 @@
 #
 # Note: It is assumed this script is run as a part of a jenkins job triggered
 #       by the gerrit plugin. Therefore it assumes certain env variables
-#       provided by that plugin are avialable (i.e. GERRIT_PROJECT, ...)
+#       provided by that plugin are available (i.e. GERRIT_PROJECT, ...)
 #
 # Required Inputs:
 #  SSH_KEY:  Path to private ssh key used to post messages to gerrit