Rollup merge of rust-lang#86405 - rust-lang:pnkfelix-incr-comp-rel-note, r=Mark-Simulacrum

Add incr-comp note for 1.53.0 relnotes

Author: m-ou-se

RELEASES.md

@@ -113,6 +113,7 @@ Compatibility Notes
   In particular, this was known to be a problem in the `lexical-core` crate,
   but they have published fixes for semantic versions 0.4 through 0.7. To
   update this dependency alone, use `cargo update -p lexical-core`.
+- Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
 
 Internal Only
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