bug: syn keyword support non alphanum characters

[Freed-Wu]

Did you check existing issues?

• I have read all the tree-sitter docs if it relates to using the parser
• I have searched the existing issues

Tree-Sitter CLI Version, if relevant (output of tree-sitter --version)

No response

Describe the bug

syn keyword   lnkSpecSections  	.text .bss .cinit .data .data .stack .heap .sysmem .const .switch .init_array .pinit .cio

we can set iskeyword+=.. so syn keyword should support any non-space characters.

Steps To Reproduce/Bad Parse Tree

  (ERROR ; [27, 4] - [27, 121]
    (hl_group) ; [27, 14] - [27, 29]
    (keyword) ; [27, 33] - [27, 37]
    (keyword) ; [27, 39] - [27, 42]
    (keyword) ; [27, 44] - [27, 49]
    (keyword) ; [27, 51] - [27, 55]
    (keyword) ; [27, 57] - [27, 61]
    (keyword) ; [27, 63] - [27, 68]
    (keyword) ; [27, 70] - [27, 74]
    (keyword) ; [27, 76] - [27, 82]
    (keyword) ; [27, 84] - [27, 89]
    (keyword) ; [27, 91] - [27, 97]
    (keyword) ; [27, 99] - [27, 109]
    (marker_definition)) ; [27, 111] - [27, 121]

Expected Behavior/Parse Tree

No ERROR

Repro

No response