Insert POD 'item' so that documentor will know where to add PMC function documentation.  In several places, convert inline comments to POD.
Insert POD 'item' so that documentor will know where to add PMC function documentation.  In several places, convert inline comments to POD.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@48498 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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