bitset_specs: correction subtitle

jvdp1 · jvdp1 · commit d1bf5d08bef4 · 2020-11-24T21:40:30.000+01:00
diff --git a/doc/specs/stdlib_bitsets.md b/doc/specs/stdlib_bitsets.md
@@ -298,7 +298,7 @@ otherwise it is `.false.`.
     end program demo_all
 ```
 
-#### `and` - bitwise `and` of the bits of two bitsets.
+### `and` - bitwise `and` of the bits of two bitsets.
 
 #### Status
 
