Specify 1m/s as 1m/s instead of 3.1556926e7 m/year

doc/sphinx/manual/modeling-choices/subglacier/basal-strength.rst

@@ -129,12 +129,9 @@ combination:
 
    -pseudo_plastic \
    -pseudo_plastic_q 1.0 \
-   -pseudo_plastic_uthreshold 3.1556926e7 \
+   -pseudo_plastic_uthreshold 1m/s \
    -yield_stress constant -tauc beta
 
-This sets `u_{\text{threshold}}` to 1 `\text{m}\,\text{s}^{-1}` but using units
-`\text{m}\,\text{a}^{-1}`.
-
 More generally, it is common in the literature to see power-law sliding relations in the
 form
 
@@ -149,7 +146,7 @@ where `C` is a constant, as for example in sections :ref:`sec-MISMIP` and
 
    -pseudo_plastic \
    -pseudo_plastic_q m \
-   -pseudo_plastic_uthreshold 3.1556926e7 \
+   -pseudo_plastic_uthreshold 1m/s \
    -yield_stress constant \
    -tauc C