Add documentation for [authorsAlphaLNI] citation key pattern (#547)

* Add documentation for `authorsAlphaLNI`

* Fix lint tests on changed file

Author: subhramit

en/setup/citationkeypatterns.md

@@ -31,6 +31,16 @@ Several special field markers are offered, which extract only a specific part of
   * One author: The first three letters of the last name
   * Two to four authors: The first letter of the last name of each author
   * More than four authors: The first letter of the first three authors' last name. A `+` is added at the end if it is not in the [list of unwanted characters](citationkeypatterns.md#removing-unwanted-characters).
+* **`[authorsAlphaLNI]`**: Follows the LNI (Lecture Notes in Informatics) template style,
+  * **Single author or "and others" case**:
+    * First two characters of the first author's last name
+    * For organizations (names in braces), returns organization initials
+  * **Multiple authors without "and others"**:
+    * Takes the first letter of each author's last name
+    * Maximum of 4 characters total
+  * **Special cases**:
+    * Prefixes like "van", "von" are ignored when getting the last name
+    * When "and others" is present with multiple authors, reverts to using first two characters of first author
 * **`[authorLast]`**: The last name of the last author.
 * **`[authorLastForeIni]`**: The forename initial of the last author.
 
@@ -155,13 +165,13 @@ The default key pattern is **`[auth][year]`**, and this could produce keys like
 
 To change the citation key pattern to `[authors][camel]` for all libraries without individual settings, execute the following steps:
 
-1.  Open the preferences
+1. Open the preferences
 
     <img src="../.gitbook/assets/optionspreferences%20(10).png" alt="File → Preferences" data-size="original">
-2.  Navigate to "Citation key generator"
+2. Navigate to "Citation key generator"
 
     <img src="../.gitbook/assets/preferences-citation-key-generator (2).png" alt="Citation key generator preferences" data-size="original">
-3.  Change the default pattern to `[authors][camel]`
+3. Change the default pattern to `[authors][camel]`
 
     <img src="../.gitbook/assets/preferences-citation-key-generator-authors-camel (8).png" alt="Citation key generator preferences - authors camel" data-size="original">
 4. Press "Enter" (forgetting to do this is a leading cause of puzzlement)
@@ -171,12 +181,12 @@ To change the citation key pattern to `[authors][camel]` for all libraries witho
 
 To change the citation key patterns for a single library to `[auth][shortyear]`,
 
-1.  Make sure the library is open and selected in the JabRef main window
+1. Make sure the library is open and selected in the JabRef main window
 
     <img src="../.gitbook/assets/main-screen-selected-library (7).png" alt="Main screen selected library" data-size="original">
-2.  From the "Library" menu, open the "Citation key pattern" setting
+2. From the "Library" menu, open the "Citation key pattern" setting
 
     <img src="../.gitbook/assets/library-citation-key-patterns (3).png" alt="Library Citation key patterns" data-size="original">
-3.  Set the pattern for the desired entry types, and press the apply button.
+3. Set the pattern for the desired entry types, and press the apply button.
 
     <img src="../.gitbook/assets/citation-key-patterns (8).png" alt="Citation key patterns" data-size="original">