Changed foo -> example

Author: paulmeyer90

EXPLAINER.md

@@ -47,7 +47,7 @@ Deprecations are reports indicating that a browser API or feature has been used
     "id": "websql", 
     "anticipatedRemoval": "1/1/2020", 
     "message": "WebSQL is deprecated and will be removed in Chrome 97 around January 2020",
-    "sourceFile": "https://foo.com/index.js",
+    "sourceFile": "https://example.com/index.js",
     "lineNumber": 1234,
     "columnNumber": 42
   }
@@ -73,7 +73,7 @@ An [intervention](https://github.com/WICG/interventions/blob/master/README.md) o
   "body": {
     "id": "audio-no-gesture", 
     "message": "A request to play audio was blocked because it was not triggered by user activation (such as a click).",
-    "sourceFile": "https://foo.com/index.js",
+    "sourceFile": "https://example.com/index.js",
     "lineNumber": 1234,
     "columnNumber": 42
   }

index.src.html

@@ -1197,7 +1197,7 @@ <h3 id="deprecation-report">Deprecation</h3>
       "id": "websql",
       "anticipatedRemoval": "1/1/2020",
       "message": "WebSQL is deprecated and will be removed in Chrome 97 around January 2020",
-      "sourceFile": "https://foo.com/index.js",
+      "sourceFile": "https://example.com/index.js",
       "lineNumber": 1234,
       "columnNumber": 42
     }
@@ -1232,8 +1232,8 @@ <h3 id="intervention-report">Intervention</h3>
   {{InterventionReportBody}}, contains the following fields:
 
     - <dfn for="InterventionReportBody">id</dfn>: an implementation-defined
-      string identifying the specific intervention that occurred. This string can
-      be used for grouping and counting related reports.
+      string identifying the specific intervention that occurred. This string
+      can be used for grouping and counting related reports.
 
     - <dfn for="InterventionReportBody">message</dfn>: A human-readable string
       with details typically matching what would be displayed on the developer
@@ -1261,7 +1261,7 @@ <h3 id="intervention-report">Intervention</h3>
     "body": {
       "id": "audio-no-gesture",
       "message": "A request to play audio was blocked because it was not triggered by user activation (such as a click).",
-      "sourceFile": "https://foo.com/index.js",
+      "sourceFile": "https://example.com/index.js",
       "lineNumber": 1234,
       "columnNumber": 42
     }