Corrected typos in docstrings of wrapRelationshipSpec and wrapAttributeSpec.

[ghypz]

Description of Change(s)

Corrected a few typos in the docstrings of the AttributeSpec and RelationshipSpec python wrappers.

Fixes Issue(s)

• https://github.com/PixarAnimationStudios/OpenUSD/issues/3034

• [x] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[ghypz]

Still looking into running the tests. Will update the description as soon as this is done. :)

[jesschimein]

Filed as internal issue #USD-10197

[jesschimein]

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