doc: camelCase the config variables to improve readability

References to multi-word configuration variable names in our
documentation must consistently use camelCase to highlight where
the word boundaries are, even though these are treated case
insensitively.

Fix a few places that spell them in all lowercase, which makes
them harder to read.

Signed-off-by: Kaartic Sivaraam <kaarticsivaraam91196@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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