NEWS and doc updates for always-sharing reshape behavior

closes #4211

[ci skip]

NEWS.md

@@ -63,6 +63,9 @@ Breaking changes
     `pmap(retry(f), c)` or `pmap(@catch(f), c)` can be used instead.
     ([#15409](https://github.com/JuliaLang/julia/pull/15409#discussion_r57494701)).
 
+  * `reshape` is now defined to always share data with the original array.
+    If a reshaped copy is needed, use `copy(reshape(a))` or `copy!` to a new array of
+    the desired shape ([#4211]).
 
 Library improvements
 --------------------
@@ -160,6 +163,7 @@ Deprecated or removed
 
 [PkgDev]: https://github.com/JuliaLang/PkgDev.jl
 <!--- generated by NEWS-update.jl: -->
+[#4211]: https://github.com/JuliaLang/julia/issues/4211
 [#8036]: https://github.com/JuliaLang/julia/issues/8036
 [#8846]: https://github.com/JuliaLang/julia/issues/8846
 [#9503]: https://github.com/JuliaLang/julia/issues/9503
@@ -190,6 +194,7 @@ Deprecated or removed
 [#15192]: https://github.com/JuliaLang/julia/issues/15192
 [#15242]: https://github.com/JuliaLang/julia/issues/15242
 [#15258]: https://github.com/JuliaLang/julia/issues/15258
+[#15409]: https://github.com/JuliaLang/julia/issues/15409
 [#15550]: https://github.com/JuliaLang/julia/issues/15550
 [#15609]: https://github.com/JuliaLang/julia/issues/15609
 [#15763]: https://github.com/JuliaLang/julia/issues/15763

base/docs/helpdb/Base.jl

@@ -1565,9 +1565,7 @@ ind2chr
 """
     reshape(A, dims)
 
-Create an array with the same data as the given array, but with different dimensions. An
-implementation for a particular type of array may choose whether the data is copied or
-shared.
+Create an array with the same data as the given array, but with different dimensions.
 """
 reshape