More prep for splitting up

Author: aturon

text/0000-io-os-reform.md

@@ -447,15 +447,23 @@ counts, arguments to `main`, and so on).
 ## Revising `Reader` and `Writer`
 [Revising `Reader` and `Writer`]: #revising-reader-and-writer
 
+> To be added in a follow-up PR.
+
 ## String handling
 [String handling]: #string-handling
 
+> To be added in a follow-up PR.
+
 ## Deadlines
 [Deadlines]: #deadlines
 
+> To be added in a follow-up PR.
+
 ## Splitting streams and cancellation
 [Splitting streams and cancellation]: #splitting-streams-and-cancellation
 
+> To be added in a follow-up PR.
+
 ## Modules
 [Modules]: #modules
 
@@ -465,21 +473,33 @@ throughout IO, we can go on to explore the modules in detail.
 ### `core::io`
 [core::io]: #coreio
 
+> To be added in a follow-up PR.
+
 ### The `std::io` facade
 [The std::io facade]: #the-stdio-facade
 
+> To be added in a follow-up PR.
+
 ### `std::env`
 [std::env]: #stdenv
 
+> To be added in a follow-up PR.
+
 ### `std::fs`
 [std::fs]: #stdfs
 
+> To be added in a follow-up PR.
+
 ### `std::net`
 [std::net]: #stdnet
 
+> To be added in a follow-up PR.
+
 ### `std::process`
 [std::process]: #stdprocess
 
+> To be added in a follow-up PR.
+
 ### `std::os`
 [std::os]: #stdos
 
@@ -490,6 +510,8 @@ specific platform submodules (like `linux`, `macos`) over time.
 ## Odds and ends
 [Odds and ends]: #odds-and-ends
 
+> To be expanded in a follow-up PR.
+
 ### The `io` prelude
 [The io prelude]: #the-io-prelude
 
@@ -525,4 +547,4 @@ principles or visions) are outside the scope of this RFC.
 # Unresolved questions
 [Unresolved questions]: #unresolved-questions
 
-(To be extended by specific follow-up PRs.)
+> To be expanded in a follow-up PR.