修复2.8.5 log 相关公式部分

[zhoudaixing]

修复2.8.5 log 相关公式部分

$log_{n}$ -> $\log_{}{n}$ $log_{n}$ -> $\log_{}{n}$

$log2(n)$ -> $\log_{2}{n}$ $log2(n)$ -> $\log_{2}{n}$

补上常数项遗漏加粗

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[mancuoj]

这个修改感觉没有必要