Cosmetics.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

protocol/protocol.tex

@@ -8735,7 +8735,7 @@ Define:
 \vspace{-1ex}
 \begin{formulae}
 \hfuzz=10pt
-  \item $\mean(S) := \hfrac{\ssum{i=1}{\length(S)} S_i}{\length(S)}$.
+  \item $\mean(S) := \hfrac{\ssum{i=1}{\length(S)} S_i}{\length(S)}$
   \item $\median(S) := \sorted(S)_{\sceiling{\length(S) / 2}}$
   \item $\bound{\Lower}{\Upper}(x) := \maximum(\Lower, \minimum(\Upper, x)))$
   \item $\trunc{x} := \begin{cases}
@@ -8754,7 +8754,7 @@ Define:
   \item $\MeanTarget(\BlockHeight) := \begin{cases}
           \PoWLimit, \hspace{16em}\text{if } \BlockHeight \leq \PoWAveragingWindow \\
           \mean(\listcomp{\ToTarget(\nBits(i)) \for i \from \BlockHeight - \PoWAveragingWindow \upto \BlockHeight - 1}),\\
-                     \hspace{20.7em}\text{otherwise}
+                     \hspace{20.7em}\text{otherwise.}
         \end{cases}$
 \end{formulae}