Improve Jira issue matching docs

doc/integration/jira/configure.md

@@ -58,8 +58,8 @@ To configure your project settings in GitLab:
    - To [transition Jira issues automatically](../../user/project/issues/managing_issues.md#closing-issues-automatically) in GitLab,
    select the **Enable Jira transitions** checkbox.
 1. In the **Jira issue matching** section:
-   - For **Jira issue regex**, [enter a regex pattern](issues.md#use-regular-expression).
-   - For **Jira issue prefix**, [enter a prefix](issues.md#use-a-prefix).
+   - For **Jira issue regex**, [enter a regex pattern](issues.md#define-a-regex-pattern).
+   - For **Jira issue prefix**, [enter a prefix](issues.md#define-a-prefix).
 1. In the **Issues** section:
    - To [view Jira issues](issues.md#view-jira-issues) in GitLab, select the **Enable Jira issues** checkbox and
    enter a Jira project key. You can only view issues from a single Jira project in a GitLab project.

doc/integration/jira/issues.md

@@ -67,12 +67,16 @@ Jira issue can't be merged. The merge request displays the message
 
 You can configure custom rules for how GitLab matches Jira issue keys by defining:
 
-- [A regex pattern](#use-regular-expression)
-- [A prefix](#use-a-prefix)
+- [A regex pattern](#define-a-regex-pattern)
+- [A prefix](#define-a-prefix)
 
-When you do not configure custom rules, the [default behavior](https://gitlab.com/gitlab-org/gitlab/-/blob/9b062706ac6203f0fa897a9baf5c8e9be1876c74/lib/gitlab/regex.rb#L245) is used.
+When you do not configure custom rules, the
+[default behavior](https://gitlab.com/gitlab-org/gitlab/-/blob/9b062706ac6203f0fa897a9baf5c8e9be1876c74/lib/gitlab/regex.rb#L245) is used.
 
-### Use regular expression
+### Define a regex pattern
+
+You can use a regular expression (regex) to match Jira issue keys.
+The regex pattern must follow the [RE2 syntax](https://github.com/google/re2/wiki/Syntax).
 
 To define a regex pattern for Jira issue keys:
 
@@ -83,14 +87,14 @@ To define a regex pattern for Jira issue keys:
 1. In the **Jira issue regex** text box, enter a regex pattern.
 1. Select **Save changes**.
 
-The regular expression must follow the [RE2 syntax](https://github.com/google/re2/wiki/Syntax).
-
-For more information, see the [Atlassian documentation](https://confluence.atlassian.com/adminjiraserver073/changing-the-project-key-format-861253229.html).
+For more information, see the
+[Atlassian documentation](https://confluence.atlassian.com/adminjiraserver073/changing-the-project-key-format-861253229.html).
 
-### Use a prefix
+### Define a prefix
 
-You can define a prefix for GitLab to match Jira issue keys. For example, if your Jira issue ID is `ALPHA-1`
-and you've set a `JIRA#` prefix, GitLab matches `JIRA#ALPHA-1` rather than `ALPHA-1`.
+You can use a prefix to match Jira issue keys.
+For example, if your Jira issue key is `ALPHA-1` and you define a `JIRA#` prefix,
+GitLab matches `JIRA#ALPHA-1` rather than `ALPHA-1`.
 
 To define a prefix for Jira issue keys: