RFR: 4622866: javax.swing.text.Document.remove(int, int) has a misleading picture

[Alexey Ivanov]

The image in the [documentation for `Document.remove`](https://docs.oracle.com/en/java/javase/17/docs/api/java.desktop/javax/swing/text/Document.html#remove(int,int)) looks as if the portion between the offsets 6 and 10 is removed. However, the entire region for _‘quick ’_ is highlighted.

I updated the image to mark the start offset 4 and the end offset 10. The new image is in SVG format which looks crisp on modern High DPI displays.

I added a sentence that describes the image, which makes the documentation accessible and clearer.

Also, I marked up references to classes and members with `{@code}`.

Look at the updated version: [`Document.remove` in JDK 22](https://cr.openjdk.org/~aivanov/4622866/api/java.desktop/javax/swing/text/Document.html#remove(int,int)).

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Commit messages:
 - Update example description
 - Adjust arrow start to accommodate for larger font
 - Remove {@code} formatting from ‘the Document structure’
 - Describe the removal of ‘quick’
 - Adjust fonts: use Arial by default, increase size to 13px
 - Use ‘shape-rendering: crispEdges’ for rectangles and lines
 - Delete unused Document-remove.gif
 - Markup class and method references with {@code}
 - 4622866: javax.swing.text.Document.remove(int, int) has a misleading picture

Changes: https://git.openjdk.org/jdk/pull/15701/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15701&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-4622866
  Stats: 174 lines in 3 files changed: 162 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/15701.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15701/head:pull/15701

PR: https://git.openjdk.org/jdk/pull/15701