Update syntax.md with options.terminology

Author: kvid

docs/syntax.md

@@ -392,6 +392,24 @@ If any component is defined in the `connectors` or `cables` sections but not ref
 
   # Character to split template and designator for autogenerated components
   template_separator: <str>    # Default = '.'
+
+  # Terms to be replaced by user defined terms
+  terminology: <terminology>   # see below
+```
+
+
+## Terminology
+
+A selection of terms can optionally be replaced by user defined terms.
+
+This is a simple literal replacement of such terms in the diagram and BOM output. The original term is assumed in grammatical variations, like "{pin}s" and "{shield}ed", and that might create weird results in some use cases.
+
+These are the supported terms (all entries are optional):
+```yaml
+terminology:
+  pin: <str>
+  wire: <str>
+  shield: <str>
 ```