[Docs] Clean up PreReleaseNotes for 4.6.1

docs/PreReleaseNotes.txt

@@ -11,27 +11,8 @@ Prerelease Notes
   * **[Server]** Handle systemd socket inheritance.
 
 + **Major bug fixes**
-  * **[Proxy Server]** Avoid SEGV when close(), closedir() returns an error.
-  * **[cmsd]** Fix feature interaction causing improper file existence to be sent.
-  * **[XrdCrypto/XrdSecgsi]** Make sure the CRL is loaded for the right CA.
-  * **[XrdCrypto]** Support for OpenSSL 1.1
-  * **[XrdSecgsi]** Improve detection of errors when loading CRL.
-  * **[XrdSecgsi]** Fix for valid legacy proxy detection (PR #469)
-  * **[XrdSecgsi]** Absent CRLs not an error (#465)
-  * **[XrdSecgsi]** Fix for CA chain verification segfault (issue #463)
-  * **[XrdSecgsi]** Two memory leaks (PR #503)
-  * **[XrdCl]** Make sure there is no request/response mismatch, when 
-                the retry logics tries to recover from an error.
-  * **[XrdCl/Server]** Be case insensitive when it comes to checksum names.
 
 + **Minor bug fixes**
-  * **[XrdHttp]** Make the XrdHttpSecXtractor API backwards compatible.
-  * **[XrdFileCache]** Make caching proxy configuration backwards 
-                       compatible.
-  * **[XrdSec]** Use CommonCrypto header instead of openssl for SHA on OSX. 
 
 + **Miscellaneous**
   * **[Proxy Server]** Simplify delayed destruction on wait vs post.
-  * **[XrdPosix]** Add new minpages option to pss.cache to support large pages.
-  * **{XrdApps]** Remove XrdClient dependency from xrdadler32.
-  * **[Server]** Add XrdCksAssist functions to help handle XRootD checksums.