[time] Fix typos in documentation

frontend/ui/time.lua

@@ -77,9 +77,9 @@ All other time variables (a handful) get the appropriate suffix `_ms`, `_us`, `_
 
     local start_time = time.now()
     -- Do some stuff.
-    -- You can add and subtract `fts times` objects.
-    local duration = time.now() - start.fts
-    -- And convert that object to various more human-readable formats, e.g.,
+    -- You can add and subtract `fts times` objects
+    local duration = time.now() - start_time
+    -- and convert that object to various more human-readable formats, e.g.,
     print(string.format("Stuff took %.3fms", time.to_ms(duration)))
 
     local offset = time.s(100)
@@ -107,25 +107,25 @@ local FTS2US = 1 / US2FTS
 -- Fixed point time
 local time = {}
 
---- Sometimes we need a very large time
+--- Sometimes we need a very large time.
 time.huge = math.huge
 
---- Creates a time (fts) from a number in seconds
+--- Creates a time (fts) from a number in seconds.
 function time.s(seconds)
     return math.floor(seconds * S2FTS)
 end
 
---- Creates a time (fts) from a number in milliseconds
+--- Creates a time (fts) from a number in milliseconds.
 function time.ms(msec)
     return math.floor(msec * MS2FTS)
 end
 
---- Creates a time (fts) from a number in microseconds
+--- Creates a time (fts) from a number in microseconds.
 function time.us(usec)
     return math.floor(usec * US2FTS)
 end
 
---- Creates a time (fts) from a structure similar to timeval
+--- Creates a time (fts) from a structure similar to timeval.
 function time.timeval(tv)
     return tv.sec * S2FTS + tv.usec * US2FTS
 end
@@ -159,7 +159,7 @@ end
 
 --[[-- Compare a past *MONOTONIC* fts time to *now*, returning the elapsed time between the two. (sec.usecs variant)
 
-Returns a Lua (decimal) number (sec.usecs, with decimal places) (accurate to the µs)
+Returns a Lua (decimal) number (sec.usecs, with decimal places) (accurate to the µs).
 ]]
 function time.since(start_time)
     -- Time difference