Fix typos in vnc-hardcoded-server-name-removed releasenotes

This is to fix the typos in vnc-hardcoded-server-name-removed
releasenotes.

Change-Id: I0303467f2b0cdaa71eb76e14424175902ce40811
diff --git a/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml b/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml
index 0da2ddc..d3a6851 100644
--- a/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml
+++ b/releasenotes/notes/vnc-hardcoded-server-name-removed-6f8d1e90a175dc08.yaml
@@ -2,9 +2,9 @@
 features:
   - |
     New string configuration option ``vnc_server_header`` is added
-    to ``compute-feature-enabled`` section. It offers to provide VNC server
-    name that is to be expected in the responce header. For example, obvious
-    at hand names is 'WebSockify', 'nginx'.
+    to ``compute-feature-enabled`` section. It allows the expected
+    VNC server name in the response header to be specified. For example,
+    obvious at hand names are 'WebSockify', 'nginx'.
 fixes:
   - |
     Fix VNC server response header issue when it is behind reverse proxy