Rollup merge of #26603 - Gankro:ref, r=steveklabnik

Quick poll of basically the entire core team says this is ok.

Author: Manishearth

Diff for: src/doc/reference.md

@@ -1047,11 +1047,8 @@ This is a list of behavior not considered *unsafe* in Rust terms, but that may
 be undesired.
 
 * Deadlocks
-* Reading data from private fields (`std::repr`)
 * Leaks of memory and other resources
 * Exiting without calling destructors
-* Sending signals
-* Accessing/modifying the file system
 * Integer overflow
   - Overflow is considered "unexpected" behavior and is always user-error,
     unless the `wrapping` primitives are used. In non-optimized builds, the compiler

Diff for: src/doc/trpl/unsafe.md

@@ -12,7 +12,7 @@ two contexts. The first one is to mark a function as unsafe:
 
 ```rust
 unsafe fn danger_will_robinson() {
-    // scary stuff 
+    // scary stuff
 }
 ```
 
@@ -68,11 +68,8 @@ Whew! That’s a bunch of stuff. It’s also important to notice all kinds of
 behaviors that are certainly bad, but are expressly _not_ unsafe:
 
 * Deadlocks
-* Reading data from private fields
-* Leaks due to reference count cycles
+* Leaks of memory or other resources
 * Exiting without calling destructors
-* Sending signals
-* Accessing/modifying the file system
 * Integer overflow
 
 Rust cannot prevent all kinds of software problems. Buggy code can and will be