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man: reword description of BUILD_ID in os-release
Our description was pretty hard to parse. Let's replace it with a description loosely based on a fairly clear description written by a distro that actually uses BUILD_ID: https://developer.rigado.com/docsets/Working-with-the-Rigado-Vesta-Gateway/latest/production/versioning-images.html#the-rigos-scheme.
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@ -224,12 +224,13 @@
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<varlistentry>
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<term><varname>BUILD_ID=</varname></term>
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<listitem><para>A string uniquely identifying the system image used as the origin for a distribution
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(it is not updated with system updates). The field can be identical between different
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<varname>VERSION_ID</varname>s as <varname>BUILD_ID</varname> is an only a unique identifier to a
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specific version. Distributions that release each update as a new version would only need to use
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<varname>VERSION_ID</varname> as each build is already distinct based on the
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<varname>VERSION_ID</varname>. This field is optional.</para>
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<listitem><para>A string uniquely identifying the system image originally used as the installation
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base. In most cases, <varname>VERSION_ID</varname> or
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<varname>IMAGE_ID</varname>+<varname>IMAGE_VERSION</varname> are updated when the entire system
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image is replaced during an update. <varname>BUILD_ID</varname> may be used in distributions where
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the original installation image version is important: <varname>VERSION_ID</varname> would change
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during incremental system updates, but <varname>BUILD_ID</varname> would not. This field is
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optional.</para>
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<para>Examples: <literal>BUILD_ID="2013-03-20.3"</literal>, <literal>BUILD_ID=201303203</literal>.
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</para></listitem>
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@ -261,6 +262,13 @@
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</para></listitem>
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</varlistentry>
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</variablelist>
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<para>To summarize: if the image updates are built and shipped as comprehensive units,
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<varname>IMAGE_ID</varname>+<varname>IMAGE_VERSION</varname> is the best fit. Otherwise, if updates
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eventually completely replace previously installed contents, as in a typical binary distribution,
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<varname>VERSION_ID</varname> should be used to identify major releases of the operating system.
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<varname>BUILD_ID</varname> may be used instead or in addition to <varname>VERSION_ID</varname> when
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the original system image version is important.</para>
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</refsect2>
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<refsect2>
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