Merge branch '6.1' into 6.2

* 6.1:
  Typos In Comments
  typo s/retrieveing/retrieving
  Typos on 6.0 branch
  remove duplicated catch block
  s/<\br>/<br>
  [HttpClient] Fix retrying requests when the content is used by the strategy

Author: fabpot

Tests/HttpCache/HttpCacheTest.php

@@ -692,7 +692,7 @@ public function testDegradationWhenCacheLocked()
 
         $this->cacheConfig['stale_while_revalidate'] = 10;
 
-        // The prescence of Last-Modified makes this cacheable (because Response::isValidateable() then).
+        // The presence of Last-Modified makes this cacheable (because Response::isValidateable() then).
         $this->setNextResponse(200, ['Cache-Control' => 'public, s-maxage=5', 'Last-Modified' => 'some while ago'], 'Old response');
         $this->request('GET', '/'); // warm the cache