docs: document the removal of IA32 Linux support (#34805)

* docs: document the removal of IA32 Linux support

Chromium had dropped support for IA32 Linux, so the Chromium
102.0.4999.0 upgrade PR,
#33731, had introduced the commit,
389ef07,
to drop support for IA32 Linux but the change landed without an addition
to the documentation for the breaking changes, so this PR adds that.

Closes: #34783
Refs: https://bugs.chromium.org/p/chromium/issues/detail?id=1194538
Signed-off-by: Darshan Sen <raisinten@gmail.com>

* Update docs/breaking-changes.md

Co-authored-by: Keeley Hammond <vertedinde@electronjs.org>

Co-authored-by: Darshan Sen <raisinten@gmail.com>
Co-authored-by: Jeremy Rose <nornagon@nornagon.net>
Co-authored-by: Keeley Hammond <vertedinde@electronjs.org>

docs/breaking-changes.md

@@ -36,7 +36,10 @@ requires unsafe mode), so Electron is unable to support this feature on Linux.
 
 ## Planned Breaking API Changes (19.0)
 
-None
+### Removed: IA32 Linux binaries
+
+This is a result of Chromium 102.0.4999.0 dropping support for IA32 Linux.
+This concludes the [removal of support for IA32 Linux](#removed-ia32-linux-support).
 
 ## Planned Breaking API Changes (18.0)
 
@@ -1203,6 +1206,10 @@ not present, then the native module will fail to load on Windows, with an error
 message like `Cannot find module`. See the [native module
 guide](/docs/tutorial/using-native-node-modules.md) for more.
 
+### Removed: IA32 Linux support
+
+Electron 18 will no longer run on 32-bit Linux systems. See [discontinuing support for 32-bit Linux](https://www.electronjs.org/blog/linux-32bit-support) for more information.
+
 ## Breaking API Changes (3.0)
 
 The following list includes the breaking API changes in Electron 3.0.