Fix docstrings

Author: MatteoCati

src/sage/combinat/designs/difference_family.py

@@ -1892,7 +1892,7 @@ def get_fixed_relative_difference_set(rel_diff_set, as_elements=False):
 
 def is_fixed_relative_difference_set(R, q):
     r"""Check if the relative difference set `R` is fixed by `q`.
-    
+
     A relative difference set  `R` is fixed by `q` if  `\{qd | d \in R\}= R` (see Section 3 of [Spe1975]_).
 
     INPUT:

src/sage/combinat/matrices/hadamard_matrix.py

@@ -1995,7 +1995,7 @@ def skew_hadamard_matrix_spence_construction(n, check=True):
     r"""
     Construct skew Hadamard matrix of order `n` using Spence constrution.
 
-    This function will construct skew Hadamrd matrix of order `n=2(q+1)` where `q` is
+    This function will construct skew Hadamard matrix of order `n=2(q+1)` where `q` is
     a prime power with `q = 5` (mod 8). The construction is taken from [Spe1977]_, and the
     relative difference sets are constructed using :func:`sage.combinat.designs.difference_family.relative_difference_set_from_homomorphism`.
 
@@ -2085,6 +2085,7 @@ def GS_skew_hadamard_smallcases(n, existence=False, check=True):
     Namely, it needs 4 circulant matrices with extra properties, as described in
     :func:`sage.combinat.matrices.hadamard_matrix.williamson_goethals_seidel_skew_hadamard_matrix`
     Matrices are taken from:
+
     * `n=36, 52`: [GS70s]_
     * `n=92`: [Wall71]_
     * `n=188`: [Djo2008a]_
@@ -2328,7 +2329,7 @@ def skew_hadamard_matrix_from_good_matrices(a, b, c, d, check=True):
 
     - ``c`` -- (1,-1) list specifying the 1st row of `D`.
 
-    - ``check`` -- boolean: if True (default), check the the matrix is an Hadamard matrix before returning it.
+    - ``check`` -- boolean: if True (default), check that the matrix is a skew Hadamard matrix before returning it.
 
     EXAMPLES::