Merge pull request #21891 from JuliaLang/jrg/inv-fact-doc

Mention `inv` in docstrings of factorizations that implement it

base/linalg/lu.jl

@@ -112,6 +112,7 @@ The relationship between `F` and `A` is
 |:---------------------------------|:-----|:-----------------------|
 | [`/`](@ref)                      | ✓    |                        |
 | [`\\`](@ref)                     | ✓    | ✓                      |
+| [`inv`](@ref)                    | ✓    | ✓                      |
 | [`det`](@ref)                    | ✓    | ✓                      |
 | [`logdet`](@ref)                 | ✓    | ✓                      |
 | [`logabsdet`](@ref)              | ✓    | ✓                      |

base/linalg/qr.jl

@@ -238,7 +238,7 @@ The individual components of the factorization `F` can be accessed by indexing w
  - `F[:p]`: the permutation vector of the pivot ([`QRPivoted`](@ref) only)
  - `F[:P]`: the permutation matrix of the pivot ([`QRPivoted`](@ref) only)
 
-The following functions are available for the `QR` objects: [`size`](@ref)
+The following functions are available for the `QR` objects: [`inv`](@ref), [`size`](@ref),
 and [`\\`](@ref). When `A` is rectangular, `\\` will return a least squares
 solution and if the solution is not unique, the one with smallest norm is returned.
 

base/sparse/cholmod.jl

@@ -1511,7 +1511,7 @@ have the type tag, it must still be symmetric or Hermitian.
 A fill-reducing permutation is used. `F = ldltfact(A)` is most frequently
 used to solve systems of equations `A*x = b` with `F\\b`. The returned
 factorization object `F` also supports the methods [`diag`](@ref),
-[`det`](@ref), and [`logdet`](@ref).
+[`det`](@ref), [`logdet`](@ref), and [`inv`](@ref).
 You can extract individual factors from `F` using `F[:L]`.
 However, since pivoting is on by default, the factorization is internally
 represented as `A == P'*L*D*L'*P` with a permutation matrix `P`;