docs: correct typo in comment

[vernig]

Using a sessionId as number, it causes the following error in peg$parsetemplate:

input.charCodeAt is not a function

Fixes #277

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[vernig]

@googlebot I signed it!

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[vernig]

@googlebot I fixed it.

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[gverni]

@googlebot I consent.

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[bcoe]

@alexander-fenster @xiaozhenliu-gg5 👋 this seems like potentially a bug with the generated client.

[alexander-fenster]

Thanks @vernig - it's indeed a bug (arguably if it's a bug in samples or in the processing code :) ) We can accept this fix, but I just sent googleapis/gax-nodejs#756 to let the processing code accept numbers (so in the next version, both 123 and '123' will work).