docs: anistropy -> anisotropy

While one of these is referring to an identifier, the actual identifier
is correctly spelled.

Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7060>
diff --git a/docs/gallium/cso/sampler.rst b/docs/gallium/cso/sampler.rst
index aa544a8..f722316 100644
--- a/docs/gallium/cso/sampler.rst
+++ b/docs/gallium/cso/sampler.rst
@@ -105,8 +105,8 @@
     PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK, in which case special care has to be
     taken (see description of the cap).
 max_anisotropy
-    Maximum anistropy ratio to use when sampling from textures.  For example,
-    if max_anistropy=4, a region of up to 1 by 4 texels will be sampled.
+    Maximum anisotropy ratio to use when sampling from textures.  For example,
+    if max_anisotropy=4, a region of up to 1 by 4 texels will be sampled.
     Set to zero to disable anisotropic filtering.  Any other setting enables
     anisotropic filtering, however it's not unexpected some drivers only will
     change their filtering with a setting of 2 and higher.