Rollup merge of #51067 - mcarton:patch-1, r=steveklabnik

Add inner links in documentation

From [this SO question](https://stackoverflow.com/q/50518757/2733851) it looks like this page isn't really clear.
I personally do think this page is quite clear, the only think I could think of was adding some references.
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kennytm 2018-05-26 19:32:30 +08:00 committed by GitHub
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@ -340,7 +340,8 @@
//!
//! ## Fill/Alignment
//!
//! The fill character is provided normally in conjunction with the `width`
//! The fill character is provided normally in conjunction with the
//! [`width`](#width)
//! parameter. This indicates that if the value being formatted is smaller than
//! `width` some extra characters will be printed around it. The extra
//! characters are specified by `fill`, and the alignment can be one of the
@ -388,7 +389,8 @@
//! padding specified by fill/alignment will be used to take up the required
//! space.
//!
//! The default fill/alignment for non-numerics is a space and left-aligned. The
//! The default [fill/alignment](#fillalignment) for non-numerics is a space and
//! left-aligned. The
//! defaults for numeric formatters is also a space but with right-alignment. If
//! the `0` flag is specified for numerics, then the implicit fill character is
//! `0`.