Convert many files to intra-doc links

- Use intra-doc links for `std::io` in `std::fs`
- Use intra-doc links for File::read in unix/ext/fs.rs
- Remove explicit intra-doc links for `true` in `net/addr.rs`
- Use intra-doc links in alloc/src/sync.rs
- Use intra-doc links in src/ascii.rs
- Switch to intra-doc links in alloc/rc.rs
- Use intra-doc links in core/pin.rs
- Use intra-doc links in std/prelude
- Use shorter links in `std/fs.rs`

  `io` is already in scope.

1 files changed, 0 insertions, 2 deletions

diff --git a/library/std/src/ascii.rs b/library/std/src/ascii.rs
index c9106136d34..035cd9f243b 100644
--- a/library/std/src/ascii.rs
+++ b/library/std/src/ascii.rs
@@ -70,7 +70,6 @@ pub trait AsciiExt {
     /// inherent methods on `u8`, `char`, `[u8]` and `str`.
     ///
     /// [`make_ascii_uppercase`]: AsciiExt::make_ascii_uppercase
-    /// [`str::to_uppercase`]: ../primitive.str.html#method.to_uppercase
     #[stable(feature = "rust1", since = "1.0.0")]
     #[allow(deprecated)]
     fn to_ascii_uppercase(&self) -> Self::Owned;
@@ -91,7 +90,6 @@ pub trait AsciiExt {
     /// inherent methods on `u8`, `char`, `[u8]` and `str`.
     ///
     /// [`make_ascii_lowercase`]: AsciiExt::make_ascii_lowercase
-    /// [`str::to_lowercase`]: ../primitive.str.html#method.to_lowercase
     #[stable(feature = "rust1", since = "1.0.0")]
     #[allow(deprecated)]
     fn to_ascii_lowercase(&self) -> Self::Owned;