armclang: clarify that this is support for the Keil cross-compiler

mesonbuild/compilers/c.py

@@ -211,6 +211,10 @@ class EmscriptenCCompiler(EmscriptenMixin, ClangCCompiler):
 
 
 class ArmclangCCompiler(ArmclangCompiler, CCompiler):
+    '''
+    Keil armclang
+    '''
+
     def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                  info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                  linker: T.Optional['DynamicLinker'] = None,

mesonbuild/compilers/cpp.py

@@ -296,6 +296,10 @@ class EmscriptenCPPCompiler(EmscriptenMixin, ClangCPPCompiler):
 
 
 class ArmclangCPPCompiler(ArmclangCompiler, CPPCompiler):
+    '''
+    Keil armclang
+    '''
+
     def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                  info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                  linker: T.Optional['DynamicLinker'] = None,

mesonbuild/compilers/mixins/arm.py

@@ -136,6 +136,9 @@ class ArmCompiler(Compiler):
 
 
 class ArmclangCompiler(Compiler):
+    '''
+    This is the Keil armclang.
+    '''
 
     def __init__(self) -> None:
         if not self.is_cross: