tools: fix broken link in icu notes

Link text and url were swapped around, this pr puts
the link text inside [] and the url inside ().

PR-URL: #20030
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>

Author: harrysarson

tools/icu/README.md

@@ -1,6 +1,6 @@
 # Notes about the `tools/icu` subdirectory
 
-This directory contains tools, data, and information about the [http://icu-project.org](ICU)
+This directory contains tools, data, and information about the [ICU](http://icu-project.org)
 (International Components for Unicode) integration. ICU is used to provide
 internationalization functionality.