fixup! Update existing examples

Rename exclude file to exclude.txt

docs/usage/cli/filter.rst

@@ -36,23 +36,23 @@ A simple example use of this command would be
 This command will select all sequences with collection date in 2012 or later.
 The filter command has a large number of options that allow flexible filtering for many common situations.
 One such use-case is the exclusion of sequences that are known to be outliers (e.g. because of sequencing errors, cell-culture adaptation, ...).
-These can be specified in a separate file:
+These can be specified in a separate text file (e.g. ``exclude.txt``):
 
 .. code-block::
 
   BRA/2016/FC_DQ75D1
   COL/FLR_00034/2015
   ...
 
-To drop such strains, you can use ``--exclude``:
+To drop such strains, you can pass the filename to ``--exclude``:
 
 .. code-block:: bash
 
   augur filter \
     --sequences data/sequences.fasta \
     --metadata data/metadata.tsv \
     --min-date 2012 \
-    --exclude config/dropped_strains.txt \
+    --exclude exclude.txt \
     --output-sequences filtered_sequences.fasta \
     --output-metadata filtered_metadata.tsv