Missing closing parens on documentation

[TheIronBorn]

rust/src/libstd/fs.rs

Line 729 in 4623d48

/// [`seek`]`(`[`SeekFrom`]`::`[`Current`]`(0))`, and restore it before the next read.

Becomes

So, before writing, save the current position (using seek(SeekFrom::Current(0)), and restore it before the next read.

3 ( and only 2 )