KNOWN_BUGS: make a new section for cmake topics

Closes #6219
diff --git a/docs/KNOWN_BUGS b/docs/KNOWN_BUGS
index 4284f23..875c277 100644
--- a/docs/KNOWN_BUGS
+++ b/docs/KNOWN_BUGS
@@ -54,15 +54,11 @@
  5.3 curl compiled on OSX 10.13 failed to run on OSX 10.10
  5.4 Build with statically built dependency
  5.5 can't handle Unicode arguments in non-Unicode builds on Windows
- 5.6 cmake: use correct SONAME for shared library
  5.7 Visual Studio project gaps
  5.8 configure finding libs in wrong directory
  5.9 Utilize Requires.private directives in libcurl.pc
  5.10 SMB tests fail with Python 2
  5.11 configure --with-gssapi with Heimdal is ignored on macOS
- 5.12 cmake: support build with GnuTLS
- 5.13 cmake: unusable tool_hugehelp.c with MinGW
- 5.14 cmake: build docs/curl.1
 
  6. Authentication
  6.1 NTLM authentication and unicode
@@ -112,7 +108,7 @@
  11.11 A shared connection cache is not thread-safe
  11.12 'no_proxy' string-matches IPv6 numerical addresses
 
- 12. LDAP and OpenLDAP
+ 12. LDAP
  12.1 OpenLDAP hangs after returning results
  12.2 LDAP on Windows does authentication wrong?
  12.3 LDAP on Windows doesn't work
@@ -121,9 +117,15 @@
  13. TCP/IP
  13.1 --interface for ipv6 binds to unusable IP address
 
- 14 DICT
+ 14. DICT
  14.1 DICT responses show the underlying protocol
 
+ 15. CMake
+ 15.1 use correct SONAME for shared library
+ 15.2 support build with GnuTLS
+ 15.3 unusable tool_hugehelp.c with MinGW
+ 15.4 build docs/curl.1
+
 ==============================================================================
 
 1. HTTP
@@ -428,13 +430,6 @@
   https://curl.se/bug/?i=731
   https://curl.se/bug/?i=3747
 
-5.6 cmake: use correct SONAME for shared library
-
- The autotools build sets the SONAME properly according to VERSIONINFO in
- lib/Makefile.am and so should cmake to make comparable build.
-
- See https://github.com/curl/curl/pull/5935
-
 5.7 Visual Studio project gaps
 
  The Visual Studio projects lack some features that the autoconf and nmake
@@ -482,18 +477,6 @@
 
  https://github.com/curl/curl/issues/3841
 
-5.12 cmake: support build with GnuTLS
-
-5.13 cmake: unusable tool_hugehelp.c with MinGW
-
- see https://github.com/curl/curl/issues/3125
-
-5.14 cmake: build docs/curl.1
-
- The cmake build doesn't create the docs/curl.1 file and therefor must rely on
- it being there already. This makes the --manual option not work and test
- cases like 1139 can't function.
-
 6. Authentication
 
 6.1 NTLM authentication and unicode
@@ -796,7 +779,7 @@
 
  See https://github.com/curl/curl/issues/5745
 
-12. LDAP and OpenLDAP
+12. LDAP
 
 12.1 OpenLDAP hangs after returning results
 
@@ -850,3 +833,24 @@
  from the output.
 
  https://github.com/curl/curl/issues/1809
+
+15. CMake
+
+15.1 use correct SONAME for shared library
+
+ The autotools build sets the SONAME properly according to VERSIONINFO in
+ lib/Makefile.am and so should cmake to make comparable build.
+
+ See https://github.com/curl/curl/pull/5935
+
+15.2 support build with GnuTLS
+
+15.3 unusable tool_hugehelp.c with MinGW
+
+ see https://github.com/curl/curl/issues/3125
+
+15.4 build docs/curl.1
+
+ The cmake build doesn't create the docs/curl.1 file and therefor must rely on
+ it being there already. This makes the --manual option not work and test
+ cases like 1139 can't function.