Fix ~40 typos found by codespell across the codebase

libeigen/eigen!2181

Co-authored-by: Rasmus Munk Larsen <rmlarsen@gmail.com>

doc/HiPerformance.dox

@@ -81,7 +81,7 @@ m1 += temp.adjoint(); \endcode</td>
 m1.noalias() += m3.adjoint()
 *              * m2.adjoint(); \endcode</td>
 <td>This is because the product expression has the EvalBeforeNesting bit which
-    enforces the evaluation of the product by the Tranpose expression.</td>
+    enforces the evaluation of the product by the Transpose expression.</td>
 </tr>
 <tr class="alt">
 <td>\code

doc/Manual.dox

@@ -1,5 +1,5 @@
 
-// This file strutures pages and modules into a convenient hierarchical structure.
+// This file structures pages and modules into a convenient hierarchical structure.
 
 namespace Eigen {
 

doc/TutorialGeometry.dox

@@ -112,7 +112,7 @@ rot3 = rot1.slerp(alpha,rot2);\endcode</td></tr>
 
 <a href="#" class="top">top</a>\section TutorialGeoTransform Affine transformations
 Generic affine transformations are represented by the Transform class which internally
-is a (Dim+1)^2 matrix. In Eigen we have chosen to not distinghish between points and
+is a (Dim+1)^2 matrix. In Eigen we have chosen to not distinguish between points and
 vectors such that all points are actually represented by displacement vectors from the
 origin ( \f$ \mathbf{p} \equiv \mathbf{p}-0 \f$ ). With that in mind, real points and
 vector distinguish when the transformation is applied.