doc: revise tools/icu/README.md

* Simplify introductory sentence.
* Remove some passive voice.
* Make style in bulleted list a little more consistent.
* Remove superfluous list entry.

PR-URL: #32136
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: Trott

tools/icu/README.md

@@ -1,9 +1,8 @@
 # Notes about the `tools/icu` subdirectory
 
-This directory contains tools, data, and information about the
-International Components for Unicode integration. [ICU][] is used
-both by V8 and also by
-Node.js itself to provide internationalization functionality.
+This directory contains tools and information about the
+[International Components for Unicode][ICU] (ICU) integration.
+Both V8 and Node.js use ICU to provide internationalization functionality.
 
 * `patches/` are one-off patches, actually entire source file replacements,
   organized by ICU version number.
@@ -15,9 +14,8 @@ Node.js itself to provide internationalization functionality.
    is invoked. It builds against the `pkg-config` located ICU.
 * `iculslocs.cc` is source for the `iculslocs` utility, invoked by `icutrim.py`
    as part of repackaging. Not used separately. See source for more details.
-* `no-op.cc` — empty function to convince gyp to use a C++ compiler.
-* `README.md` — you are here
-* `shrink-icu-src.py` — this is used during upgrade (see guide below)
+* `no-op.cc` contains an empty function to convince gyp to use a C++ compiler.
+* `shrink-icu-src.py` is used during upgrade (see guide below).
 
 Note:
 > The files in this directory were written for the Node.js v0.12 effort.