Fix examples math (#468)

* remove mention of pgas

* Revert "Merge branch 'main' of https://github.com/pyth-network/documentation"

This reverts commit b2cc20f, reversing
changes made to 20caa0e.

* remove \frac{0}{0}

Author: YaserJazouane

pages/home/oracle-integrity-staking/reward-examples.mdx

@@ -24,7 +24,7 @@ $$
 \text{Publisher Rewards} \quad{R^p_p} &= {r} \times min({S^p_p}, {C}_p) = 10\% \times 100 = 10 \\
 \text{Delegator Rewards} \quad{R^d_p} &= {R_p} - {R^p_p} = 10 - 10 = 0 \\
 \text{Effective Publisher APY} \quad{r^p_p} &= \frac{R^p_p}{S^p_p} = \frac{10}{100} = 10\% \\
-\text{Effective Delegator APY} \quad{r^d_p} &= \frac{R^d_p}{S^d_p} = \frac{0}{0} = 0\% \\
+\text{Effective Delegator APY} \quad{r^d_p} &= \frac{R^d_p}{S^d_p} = 0\% \\
 \end{aligned}
 $$