Bump all nvim-specific error codes above E5000

In order to not conflict with new error codes that Vim adds, all Neovim
error codes should be above 5000.  The three existing sub-5000 error
codes (E926, E951, and E952) are now E50003, E5004, and E5005
respectively.

E953 was removed in 6167ce6df2753d5474ad49aea19f5957128ab015, so just
remove it from the help.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/functional/shada/errors_spec.lua b/test/functional/shada/errors_spec.lua
index 98ead6cc3d..19f35571d7 100644
--- a/test/functional/shada/errors_spec.lua
+++ b/test/functional/shada/errors_spec.lua
@@ -497,7 +497,7 @@ $
   it('errors when a funcref is stored in a variable', function()
     nvim_command('let F = function("tr")')
     nvim_command('set shada+=!')
-    eq('\nE951: Error while dumping variable g:F, itself: attempt to dump function reference'
+    eq('\nE5004: Error while dumping variable g:F, itself: attempt to dump function reference'
        .. '\nE574: Failed to write variable F',
        redir_exec('wshada'))
   end)
@@ -506,7 +506,7 @@ $
     nvim_command('let L = []')
     nvim_command('call add(L, L)')
     nvim_command('set shada+=!')
-    eq('\nE952: Unable to dump variable g:L: container references itself in index 0'
+    eq('\nE5005: Unable to dump variable g:L: container references itself in index 0'
        .. '\nE574: Failed to write variable L',
        redir_exec('wshada'))
   end)