Add highlighting style for placeholders
This is in accordance with Google's developer documentation style guide.
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@@ -643,7 +643,7 @@
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enabled, and it has the option to automatically restore app data when an app is
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reinstalled, so it wouldn't lose track of it being the same profile.</p>
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<p>The <code>ANDROID_ID</code> string is a 64-bit random number, unique to each
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<p>The <var>ANDROID_ID</var> string is a 64-bit random number, unique to each
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combination of profile and app signing key. The 64-bit limitation means it isn't
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particularly useful due to the possibility of collisions. It's tied to the lifetime of
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profiles and does not persist through profile deletion or a factory reset. This is
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@@ -655,13 +655,13 @@
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<p>The advertising ID is a Google Play services feature not included in the baseline
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Android API, so it isn't an API included in GrapheneOS. The advertising ID is unique
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to each profile. It isn't unique to each app signing key like <code>ANDROID_ID</code>,
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to each profile. It isn't unique to each app signing key like <var>ANDROID_ID</var>,
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but that makes little difference since apps within the same profile can communicate
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with each other with mutual consent. It's comparable to <code>ANDROID_ID</code> but
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with each other with mutual consent. It's comparable to <var>ANDROID_ID</var> but
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provides an 128-bit value so it provides a strong cryptographic guarantee against
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collisions, although a device messing with apps could set it to the same value used in
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another profile. The advertising ID is exposed via the Settings app and can be reset
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to a new random value, unlike <code>ANDROID_ID</code> which remains the same for the
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to a new random value, unlike <var>ANDROID_ID</var> which remains the same for the
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lifetime of the profile, but apps can tie it to the previous ID since they can detect
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that it changed via their own ID in their app data. The advertising ID can
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also now be disabled (zeroed).</p>
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@@ -673,7 +673,7 @@
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track of the profile. Apps previously had little reason to do things like this because
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they were able to persist data through an uninstall and reinstallation by default. The
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modern storage model means they need to request access to user data to do this. The
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existence of <code>ANDROID_ID</code> means they don't yet need to bother with that but
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existence of <var>ANDROID_ID</var> means they don't yet need to bother with that but
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that will change on GrapheneOS and will likely change for baseline Android too.
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However, profiles are the only way to provide a strong assurance of separate
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identities since the application model of the OS is designed to support communication
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