Missing f prefix on f-strings

[code-review-doctor]

Some strings looks like they're meant to be f-strings but are missing the f prefix meaning variable interpolation won't happen.

allennlp/allennlp/nn/util.py

Line 758 in 0d25f96

raise ValueError("Got average f{average}, expected one of None, 'token', or 'batch'")

allennlp/scripts/py2md.py

Line 112 in 0d25f96

"Required parameters should be documented like: '{ident} : `{type}`'\n"

allennlp/scripts/py2md.py

Line 113 in 0d25f96

"Optional parameters should be documented like: '{ident} : `{type}`, optional (default = `{expr}`)'\n"

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