typos in docs

README.md

@@ -134,7 +134,7 @@ $$
      t_{i} = F_i - I_i \approx L_j +
         (c_{\rm ack} L_j + 1 /B_{\rm eff}) S_i +
         H_{ij}(i, D_j, D_{{\rm crit}_j})
-$
+$$
 
 where
 
@@ -168,7 +168,7 @@ $`
            & D_j \ge D_{{\rm crit}_j} \cr
        \end{array} \right.
    \end{equation}
-`$
+'$
 
 where the prime in the subscript represents a re-indexing of
 entries in order of end times rather than start times. If
@@ -363,7 +363,7 @@ is to sort the incoming list of downloads into two lists. The first
 list (the crappies list) is sorted into tiers of files with the size
 of the tier equal to the number of servers $N_{\rm serv}$ in use. The
 0th tier is the smallest $N_{\rm serv}$ files, the next tier is the
-largest $N_{\rn serv}$ files below a cutoff file size (default of 2x the
+largest $N_{\rm serv}$ files below a cutoff file size (default of 2x the
 modal file size), and alternating between the smallest and biggest
 crappies out to $N_{\min}$ files. The second list is all other files,
 sorted in order of descending file size (that is, starting with the
@@ -420,4 +420,6 @@ _Flardl_ was written by Joel Berendzen.
 
 [license]: https://github.com/hydrationdynamics/flardl/blob/main/LICENSE
 [contributor guide]: https://github.com/hydrationdynamics/flardl/blob/main/CONTRIBUTING.md
+
+$$
 $$