fix(docs): display everything on the mutation filters page

The "<...>" were not visible.

lapis2-docs/src/content/docs/concepts/mutation-filters.md

@@ -3,16 +3,18 @@ title: Mutation filters
 description: Mutation filters
 ---
 
-It is possible to filter for amino acid and nucleotide bases/mutations. Multiple mutations can be provided by specifying
-a comma-separated list.
+It is possible to filter for amino acid and nucleotide bases/mutations.
+Multiple mutations can be provided by specifying a comma-separated list.
 
-A nucleotide mutation has the format <position><base>. A "base" can be one of the four nucleotides A, T, C, and G. It
-can also be - for deletion and N for unknown.
+A nucleotide mutation has the format `<position><base>`.
+A `<base>` can be one of the four nucleotides `A`, `T`, `C`, and `G`.
+It can also be `-` for deletion and `N` for unknown.
 
-An amino acid mutation has the format <gene>:<position><base>. The following genes are available: E, M, N, ORF1a, ORF1b,
-ORF3a, ORF6, ORF7a, ORF7b, ORF8, ORF9b, S. A "base" can be one of the 20 amino acid codes. It can also be - for deletion
-and X for unknown.
+An amino acid mutation has the format `<gene>:<position><base>`.
+The following genes are available: E, M, N, ORF1a, ORF1b, ORF3a, ORF6, ORF7a, ORF7b, ORF8, ORF9b, S.
+A `<base>` can be one of the 20 amino acid codes.
+It can also be `-` for deletion and `X` for unknown.
 
-The <base> can be omitted to filter for any mutation. You can write a `.` for the <base> to filter for sequences for
-which it is confirmed that no mutation occurred, i.e., has the same base as the reference genome at the specified
-position.
+The `<base>` can be omitted to filter for any mutation.
+You can write a `.` for the `<base>` to filter for sequences for which it is confirmed that no mutation occurred,
+i.e. has the same base as the reference genome at the specified position.