Fixed sizeOf to sizeof (#12347)

doc/manual.rst

@@ -3546,7 +3546,7 @@ Nonoverloadable builtins
 The following builtin procs cannot be overloaded for reasons of implementation
 simplicity (they require specialized semantic checking)::
 
-  declared, defined, definedInScope, compiles, sizeOf,
+  declared, defined, definedInScope, compiles, sizeof,
   is, shallowCopy, getAst, astToStr, spawn, procCall
 
 Thus they act more like keywords than like ordinary identifiers; unlike a

lib/pure/strutils.nim

@@ -955,10 +955,10 @@ proc toHex*(x: BiggestInt, len: Positive): string {.noSideEffect,
     if n == 0 and x < 0: n = -1
 
 proc toHex*[T: SomeInteger](x: T): string =
-  ## Shortcut for ``toHex(x, T.sizeOf * 2)``
+  ## Shortcut for ``toHex(x, T.sizeof * 2)``
   runnableExamples:
     doAssert toHex(1984'i64) == "00000000000007C0"
-  toHex(BiggestInt(x), T.sizeOf * 2)
+  toHex(BiggestInt(x), T.sizeof * 2)
 
 proc toHex*(s: string): string {.noSideEffect, rtl.} =
   ## Converts a bytes string to its hexadecimal representation.

tests/misc/tsizeof.nim

@@ -570,7 +570,7 @@ type
 
 proc payloadCheck() =
   doAssert offsetOf(Payload, vals) == 4
-  doAssert sizeOf(Payload) == 4
+  doAssert sizeof(Payload) == 4
 
 payloadCheck()