Fix a couple issues with syntax files

syntax_files/makefile.yaml

@@ -8,7 +8,7 @@ rules:
     - preproc: "\\<(ifeq|ifdef|ifneq|ifndef|else|endif)\\>"
     - statement: "^(export|include|override)\\>"
     - operator: "^[^:=	]+:"
-    - operator: "[=,%]" "\\+=|\\?=|:=|&&|\\|\\|"
+    - operator: "([=,%]|\\+=|\\?=|:=|&&|\\|\\|)"
     - statement: "\\$\\((abspath|addprefix|addsuffix|and|basename|call|dir)[[:space:]]"
     - statement: "\\$\\((error|eval|filter|filter-out|findstring|firstword)[[:space:]]"
     - statement: "\\$\\((flavor|foreach|if|info|join|lastword|notdir|or)[[:space:]]"
@@ -33,5 +33,3 @@ rules:
         start: "#"
         end: "$"
         rules: []
-    # color comment  "^	@#.*" <-- ?
-        

syntax_files/xml.yaml

@@ -13,4 +13,4 @@ rules:
         start: "<!--"
         end: "-->"
         rules: []
-    – special: "&[^;]*;"
+    - special: "&[^;]*;"