Deprecate std/sums (#18439)

* Deprecate sums

* Update changelog.md

* Update lib/std/sums.nim

* log

* format

* remove

* Update changelog.md

Co-authored-by: sandytypical <43030857+xflywind@users.noreply.github.com>

changelog.md

@@ -11,6 +11,8 @@
   or define your own `Math.trunc` polyfill using the [`emit` pragma](https://nim-lang.org/docs/manual.html#implementation-specific-pragmas-emit-pragma). Nim uses
   `Math.trunc` for the division and modulo operators for integers.
 
+- Deprecated `std/sums`.
+
 - Optional parameters in combination with `: body` syntax (RFC #405) are now opt-in via
   `experimental:flexibleOptionalParams`.
 

lib/std/sums.nim

@@ -8,6 +8,8 @@
 
 ## Accurate summation functions.
 
+{.deprecated: "use the nimble package `sums` instead.".}
+
 runnableExamples:
   import std/math