Remove upper keyword from eigh and eigvalsh. (#226)

* Remove upper keyword

* Ensure arguments are positional-only

Co-authored-by: Athan <kgryte@gmail.com>

Author: lezcano

spec/extensions/linear_algebra_functions.md

@@ -172,7 +172,7 @@ Returns the specified diagonals of a matrix (or a stack of matrices) `x`.
 _TODO: this requires complex number support to be added to the specification._
 
 (function-linalg-eigh)=
-### linalg.eigh(x, /, *, upper=False)
+### linalg.eigh(x, /)
 
 Returns the eigenvalues and eigenvectors of a symmetric matrix (or a stack of symmetric matrices) `x`.
 
@@ -184,10 +184,6 @@ Returns the eigenvalues and eigenvectors of a symmetric matrix (or a stack of sy
 
     -   input array having shape `(..., M, M)` and whose innermost two dimensions form square matrices. Must have a floating-point data type.
 
--   **upper**: _bool_
-
-    -   If `True`, use the upper-triangular part to compute the eigenvalues and eigenvectors. If `False`, use the lower-triangular part to compute the eigenvalues and eigenvectors. Default: `False`.
-
 #### Returns
 
 -   **out**: _Tuple\[ <array> ]_
@@ -210,7 +206,7 @@ Eigenvalue sort order is left unspecified.
 _TODO: this requires complex number support to be added to the specification._
 
 (function-linalg-eigvalsh)=
-### linalg.eigvalsh(x, /, *, upper=False)
+### linalg.eigvalsh(x, /)
 
 Computes the eigenvalues of a symmetric matrix (or a stack of symmetric matrices) `x`.
 
@@ -222,10 +218,6 @@ Computes the eigenvalues of a symmetric matrix (or a stack of symmetric matrices
 
     -   input array having shape `(..., M, M)` and whose innermost two dimensions form square matrices. Must have a floating-point data type.
 
--   **upper**: _bool_
-
-    -   If `True`, use the upper-triangular part to compute the eigenvalues. If `False`, use the lower-triangular part to compute the eigenvalues. Default: `False`.
-
 #### Returns
 
 -   **out**: _<array>_