doc: add configuration section to notmuch-new(1)

Increase discoverability.

doc/man1/notmuch-config.rst

@@ -102,6 +102,8 @@ database.path
 
     Default: see :ref:`database`
 
+.. _index.decrypt:
+
 index.decrypt
     Policy for decrypting encrypted messages during indexing.  Must be
     one of: ``false``, ``auto``, ``nostash``, or ``true``.
@@ -155,6 +157,8 @@ index.decrypt
 
     Default: ``auto``.
 
+.. _index.header:
+
 index.header.<prefix>
     Define the query prefix <prefix>, based on a mail header. For
     example ``index.header.List=List-Id`` will add a probabilistic
@@ -164,6 +168,8 @@ index.header.<prefix>
     supported. See :any:`notmuch-search-terms(7)` for a list of existing
     prefixes, and an explanation of probabilistic prefixes.
 
+.. _maildir.synchronize_flags:
+
 maildir.synchronize\_flags
     If true, then the following maildir flags (in message filenames)
     will be synchronized with the corresponding notmuch tags:
@@ -197,6 +203,8 @@ maildir.synchronize\_flags
 
     Default: ``true``.
 
+.. _new.ignore:
+
 new.ignore
     A list to specify files and directories that will not be searched
     for messages by :any:`notmuch-new(1)`. Each entry in the list is either:
@@ -215,6 +223,8 @@ new.ignore
 
     Default: empty list.
 
+.. _new.tags:
+
 new.tags
     A list of tags that will be added to all messages incorporated by
     **notmuch new**.

doc/man1/notmuch-new.rst

@@ -78,6 +78,16 @@ Supported options for **new** include
    to optimize the scanning of directories for new mail. This option turns
    that optimization off.
 
+CONFIGURATION
+=============
+
+Indexing is influenced by the configuration options
+:ref:`index.decrypt <index.decrypt>`, :ref:`index.header
+<index.header>`, and :ref:`new.ignore <new.ignore>`.  Tagging
+is controlled by :ref:`new.tags <new.tags>` and
+:ref:`maildir.synchronize_flags <maildir.synchronize_flags>`.  See
+:any:`notmuch-config(1)` for details.
+
 EXIT STATUS
 ===========