Rollup merge of #74819 - tmiasko:format-spec, r=joshtriplett

Point towards `format_spec`; it is in other direction

Author: Manishearth

library/alloc/src/fmt.rs

@@ -83,7 +83,7 @@
 //! # Formatting Parameters
 //!
 //! Each argument being formatted can be transformed by a number of formatting
-//! parameters (corresponding to `format_spec` in the syntax above). These
+//! parameters (corresponding to `format_spec` in [the syntax](#syntax)). These
 //! parameters affect the string representation of what's being formatted.
 //!
 //! ## Width