Add anchors for all entires

wiki/src/contribute/how/documentation/style_guide.mdwn

 [[!meta title="Documentation style guide"]]
 
+<a id="administration-password"></a>
+
 - **administration password** vs **root password**
 
   Use *administration password*. Avoid *root password* even though many
@@ -14,6 +16,8 @@
     - Start Tails and [[set up an administration
       password|doc/first_steps/startup_options/administration_password]].
 
+<a id="anchors"></a>
+
 - **anchors** (HTML anchors)
 
   Use HTML anchors to provide shortcuts when pointing people to sections
@@ -28,6 +32,8 @@
 
   - Use hyphens instead of underscores to separate words.
 
+<a id="boot"></a>
+
 - **boot** vs **start**
 
   - Use *start* and *restart* as much as possible to refer to starting a
@@ -53,6 +59,8 @@
       [[using the <span class="application">Boot Loader
       Menu</span>|doc/first_steps/startup_options#boot_loader_menu]].
 
+<a id="bulleted-lists"></a>
+
 - **bulleted lists**
 
   Refer to this article from NN/g on [presenting bulleted
@@ -66,6 +74,8 @@
     in a separate PO string in PO files by the PO plugin when building
     the website.
 
+<a id="debian-versions"></a>
+
 - **Debian and Ubuntu versions**
 
   Refer to Debian and Ubuntu versions primarily by their numbers, and additionally
@@ -77,6 +87,8 @@
 
     - *Tails Installer* is available on Ubuntu 15.10 (Wily Werewolf) or later.
 
+<a id="earlier"></a>
+
 - **earlier** and **later**
 
   Use to refer to versions of software.
@@ -89,6 +101,8 @@
 
     - If you are running macOS 10.10 (Yosemite) or earlier
 
+<a id="future-tense"></a>
+
 - **future tense**
 
 Whenever possible, use present, not future, tense. Don't switch
@@ -99,7 +113,7 @@ Present tense is easier to read than past or future tense. Simple verbs
 are easier to read and understand than complex verbs, such as verbs in
 the progressive or perfect tense.
 
-<a id="digit_grouping"></a>
+<a id="digit-grouping"></a>
 
 - **digit grouping**
 
@@ -113,7 +127,7 @@ the progressive or perfect tense.
   See [[!wikipedia Decimal_separator#Digit_grouping]] and [[!wikipedia
   ISO_31-0#Numbers]].
 
-<a id="gnome_application"></a>
+<a id="gnome-application"></a>
 
 - **GNOME applications: <i>Files</i>, <i>Disks</i>, etc.**
 
@@ -151,11 +165,15 @@ the progressive or perfect tense.
 
     - Install <span class="application">GNOME Disks</span> in Debian.
 
+<a id="graphics-card"></a>
+
 - **graphics card**
 
   And not *graphics adapters*, *graphics*, *graphical hardware*, or
   *video card*.
 
+<a id="media"></a>
+
 - **media** and **installation media**
 
   Use only in rare occasions where it is especially relevant to mention
@@ -174,12 +192,16 @@ the progressive or perfect tense.
       designed to be a live system running from a removable media: USB
       stick or DVD.
 
+<a id="network-interface"></a>
+
 - **network interface**, **Wi-Fi interface**
 
   And not *card*, *device*, or *adapter*.
 
   Still, **USB Wi-Fi adapters** are USB dongles that provide a Wi-Fi interface.
 
+<a id="persistence-feature"></a>
+
 - **persistence feature**
 
   To refer to the features available in the configuration of the
@@ -194,6 +216,8 @@ the progressive or perfect tense.
   The word *persistence* can be omitted if it is redundant from the context
   (for example on [[doc/first_steps/persistence/configure]]).
 
+<a id="procedures"></a>
+
 - **procedures** (a series of steps)
 
   - Keep the number of steps low within a procedure (for example, below
@@ -218,17 +242,23 @@ the progressive or perfect tense.
 1. Click on the <span class="guilabel">PPAs</span> button and then choose to <span class="button">Add a new PPA&hellip;</span>.
 </pre>
 
+<a id="secure-boot"></a>
+
 - **Secure Boot**
 
   Capitalize as a brand or feature. Writing *secure boot* would make it
   sound more like a magic security feature (which it is not).
 
+<a id="serial-comma"></a>
+
 - **serial comma**
 
   Place a [[!wikipedia serial comma]] immediately before the
   coordinating conjunction (usually *and* or *or*) in a series of three
   or more terms.
 
+<a id="startup-options"></a>
+
 - **startup options**
 
   To refer to the kernel command line options that can be specified from
@@ -239,10 +269,14 @@ the progressive or perfect tense.
     - Adding `radeon.dpm=0` to the [[startup
       options|/doc/first_steps/startup_options#boot_menu]].
 
+<a id="tails-greeter"></a>
+
 - **<span class="application">Tails Greeter</span>**
 
   Without an article. Not *the Greeter*. Note the formatting as an application.
 
+<a id="update"></a>
+
 - **update** vs **upgrade**
 
   - Use **upgrade** to refer to the replacement of a previous version of
@@ -264,6 +298,8 @@ the progressive or perfect tense.
     - The packages from your list of additional software will be updated
       automatically when you connect to the Internet.
 
+<a id="vulnerability"></a>
+
 - **vulnerability** or **security vulnerability**
 
   And not *hole* or *issue*.