fix: Sphinx generated incorrect type references for display

When rendering a type reference link, the trailing backtick must be followed by
a non-word character; however the code generated array and union references that
followed this backtick directly with `[` or `)` respectively. This caused a lot
of warnings to be emitted by `sphinx-build`, and resulted in incorrect output.

This adds an escaped space (`\ `) after the backticks, which `sphinx-build`
correctly interprets as a non-word character, but results in no character being
emitted to the output - thus generating the desired output.

packages/jsii-pacmak/lib/targets/sphinx.ts

@@ -523,8 +523,8 @@ class SphinxDocsGenerator extends Generator {
             switch (type.collection.kind) {
                 case spec.CollectionKind.Array:
                     result = {
-                        ref: `${ref}[]`,
-                        display: `${display}[]`
+                        ref: `${ref}\\ []`,
+                        display: `${display}\\ []`
                     };
                     break;
                 case spec.CollectionKind.Map:
@@ -551,7 +551,7 @@ class SphinxDocsGenerator extends Generator {
         // Wrap a string between parenthesis if it contains " or "
         function wrap(str: string): string {
             if (str.indexOf(' or ') === -1) { return str; }
-            return `(${str})`;
+            return `(${str}\\ )`;
         }
     }