Rollup merge of rust-lang#49176 - matthiaskrgr:config_example_rm_thinlto, r=alexcrichton

config.toml.example: thinlto bootstrap was removed

 It was removed in ff227c4 so remove the option that no longer works (we did not notice because it was commented out by default).

Author: kennytm

config.toml.example

@@ -243,11 +243,6 @@
 # compiler.
 #codegen-units = 1
 
-# Whether to enable ThinLTO (and increase the codegen units to either a default
-# or the configured value). On by default. If we want the fastest possible
-# compiler, we should disable this.
-#thinlto = true
-
 # Whether or not debug assertions are enabled for the compiler and standard
 # library. Also enables compilation of debug! and trace! logging macros.
 #debug-assertions = false