RFR: 8337287: Update image in javax.swing.text.Document.insert [v2]

[Alexey Ivanov]

> This changeset updates the image in the documentation for the `Document.insert` method. The image in `Document.remove` was updated by [JDK-4622866](https://bugs.openjdk.org/browse/JDK-4622866) in PR #15701.
> 
> Now the illustration of inserting looks similar to removing. The new image is in SVG format.
> 
> For reference:
> 
> - [`Document.insert` in JDK 22](https://docs.oracle.com/en/java/javase/22/docs/api/java.desktop/javax/swing/text/Document.html#insertString(int,java.lang.String,javax.swing.text.AttributeSet));
> - [Updated docs for JDK 24](https://cr.openjdk.org/~aivanov/8337287/api/java.desktop/javax/swing/text/Document.html#insertString(int,java.lang.String,javax.swing.text.AttributeSet)).
> 
> As in the case with `remove`, I marked up to classes and members with {@code}.

Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  Describe inserting ‘quick’ into text

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20376/files
  - new: https://git.openjdk.org/jdk/pull/20376/files/697da25b..8077bde0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20376&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20376&range=00-01

  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20376.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20376/head:pull/20376

PR: https://git.openjdk.org/jdk/pull/20376