Use ellipsis in fp.spherharm doctest

After python/cpython#121149 this was broken on CPython 3.14:

_______________ [doctest] mpmath.functions.orthogonal.spherharm ____________
EXAMPLE LOCATION UNKNOWN, not showing all tests of that example
??? >>> fp.chop(fp.quad(lambda t,p: Y1(t,p)*Y2(t,p)*dS(t,p), *sphere))
Expected:
    1.0000000000000007
Got:
    1.0000000000000004

This particular failure could be fixed by:
diff --git a/mpmath/ctx_base.py b/mpmath/ctx_base.py
index 3309bfa..2ca2fac 100644
--- a/mpmath/ctx_base.py
+++ b/mpmath/ctx_base.py
@@ -110,7 +110,8 @@ def fdot(ctx, xs, ys=None, conjugate=False):
             cf = ctx.conj
             return sum((x*cf(y) for (x,y) in xs), ctx.zero)
         else:
-            return sum((x*y for (x,y) in xs), ctx.zero)
+            return ctx.mpc(sum(((x*y).real for (x,y) in xs), ctx.zero),
+                           sum(((x*y).imag for (x,y) in xs), ctx.zero))

     def fprod(ctx, args):
         prod = ctx.one

But this is just one case for the whole test suite...

Author: skirpichev

mpmath/function_docs.py

@@ -9850,7 +9850,7 @@
     >>> Y2 = lambda t,p: fp.conj(fp.spherharm(l2,m2,t,p))
     >>> l1 = l2 = 3; m1 = m2 = 2
     >>> fp.chop(fp.quad(lambda t,p: Y1(t,p)*Y2(t,p)*dS(t,p), *sphere))
-    1.0000000000000007
+    1.000000000000000...
     >>> m2 = 1    # m1 != m2
     >>> print(fp.chop(fp.quad(lambda t,p: Y1(t,p)*Y2(t,p)*dS(t,p), *sphere)))
     0.0