bisect.insort*() docs: inconsistent formatting of O()

[jwilk]

On https://docs.python.org/3/library/bisect.html#bisect.insort_left, "O(log n)" is typeset in monospace font, but "O(n)" is not.

Linked PRs

• gh-113664: Update big O notation in bisect.rst to be consistently mono-spaced #113673
• gh-113664: Improve style of Big O notation #113695
• gh-113664: Improve style of Big O notation (math) #113724
• [3.12] gh-113664: Improve style of Big O notation (GH-113695) #113909
• [3.11] gh-113664: Improve style of Big O notation (GH-113695) #113910

[jnichols0]

Created a simple PR for this: #113673

[serhiy-storchaka]

#113695 and #113724 are two alternate PRs. One uses italic font to make big O notation looking more like mathematic formulas, other uses :math: to render them as mathematic formulas.

The latter produces nicer looking formulas, but it may be overkill.