README.md: Format and fix the 'Notes for Packagers' section.

README.md

 - [Testing](#testing)
 - [Installing](#installing)
 - [Documentation](#documentation)
-- [Notes for packagers](#notes-for-packagers)
+- [Notes for Packagers](#notes-for-packagers)
 - [eSpeak for Android](#espeak-for-android)
 - [Historical Versions](#historical-versions)
 - [Bugs](#bugs)
 command-line documentation provide a reference of the different command-line
 options available to these commands with example usage.
 
-## Notes for packagers
+## Notes for Packagers
 
-The **espeak-ng** project works as a drop-in replacement for **espeak**, with a few caveats. More specifically:
+The **espeak-ng** project works as a drop-in replacement for **espeak**, with
+a few caveats. More specifically:
 
-1. The installation creates compatibility symlinks mapping _espeak_, _speak_ and _libespeak.la_
-to their _espeak-ng_ equivalents. These are optional if you just want to install _espeak-ng_ and 
-have an _espeak_ package with the _espeak_ code and an _espeak-ng-compatibility_ package that installs the symlinks.
+1. The installation creates compatibility symlinks mapping _espeak_, _speak_
+   and _libespeak.la_ to their _espeak-ng_ equivalents. These are optional if
+   you are packaging _espeak_ using the upstream eSpeak code, and can be
+   handled in distributions in other ways, such as the
+   [Debian Alternatives](https://wiki.debian.org/DebianAlternatives) system.
 
-1. The command-line interface to _espeak-ng_ and _speak-ng_ are compatible, and will remain so, with espeak.
+2. The command-line interface to _espeak-ng_ and _speak-ng_ are compatible
+   with the upstream versions and intend to remain so. Only new command
+   options will be added.
 
-1. The C API to _libespeak-ng.so_ will remain API and ABI compatible with libespeak.so. The only change _speak_lib.h_ is a change to the
-_ESPEAK_API_ macro when building on Windows. All new APIs are being added to _espeak-ng/espeak_ng.h_.
+3. The C API to _libespeak-ng.so_ will remain API and ABI compatible with
+   _libespeak.so_. The only change `speak_lib.h` has is a change to the
+   `ESPEAK_API` macro when building on Windows. All new APIs are being added
+   to `espeak-ng/espeak_ng.h`.
 
-1. The _espeak-data_ files have been modified slightly. Currently _espeak-ng_ can read _espeak_ data, but _espeak_ cannot read _espeak-ng_ data,
-because espeak-ng uses a different voice data so that both _espeak_ and _espeak-ng_ can be installed on the same machine without problems.
+4. The _espeak-data_ files have been modified slightly. Currently _espeak-ng_
+   can read _espeak_ data, but _espeak_ cannot read _espeak-ng_ data, because
+   _espeak-ng_ uses a different voice data so that both _espeak_ and
+   _espeak-ng_ can be installed on the same machine without problems.
 
-1. The _espeak-ng_ project does not include _espeakedit_. The voice data is built using the _espeak-ng_ command line itself.
-Currently, to create and edit the voice data, you need _espekaedit_ from the _espeak_ project.
+5. The _espeak-ng_ project does not include _espeakedit_. The voice data is
+   built using the _espeak-ng_ command line itself. Currently, to create and
+   edit the voice data, you need _espeakedit_ from the _espeak_ project.
 
 ## eSpeak for Android