Documentation: remove invalid file characters (apple#34)

`:` is not supported on Windows as a valid file name character.  Replace
the `:` with `-`.

Author: compnerd

Documentation/Announcement-benchmarks/Library.json

@@ -5,7 +5,7 @@
   "contents": [
     {
       "kind": "chart",
-      "title": "Deque: random access lookups",
+      "title": "Deque - random access lookups",
       "tasks": [
         "Deque<Int> subscript get, random offsets (discontiguous)",
         "Array<Int> subscript get, random offsets",
@@ -14,7 +14,7 @@
     },
     {
       "kind": "chart",
-      "title": "Deque: prepending individual integers",
+      "title": "Deque - prepending individual integers",
       "tasks": [
         "Deque<Int> prepend, reserving capacity",
         "Array<Int> prepend, reserving capacity",

Documentation/Announcement-benchmarks/Results.md

@@ -5,12 +5,12 @@ Click to expand individual items below.
   <summary><strong>All results</strong></summary>
   <ul>
   <details>
-    <summary>01: Deque: random access lookups</summary>
-    <img src="Results/01%20Deque:%20random%20access%20lookups.png">
+    <summary>01: Deque - random access lookups</summary>
+    <img src="Results/01%20Deque%20-%20random%20access%20lookups.png">
   </details>
   <details>
-    <summary>02: Deque: prepending individual integers</summary>
-    <img src="Results/02%20Deque:%20prepending%20individual%20integers.png">
+    <summary>02: Deque - prepending individual integers</summary>
+    <img src="Results/02%20Deque%20-%20prepending%20individual%20integers.png">
   </details>
   <details>
     <summary>03: OrderedSet lookups</summary>