Fix typos in the source code (#3048)

bin/fzf-tmux

@@ -180,8 +180,8 @@ trap 'cleanup' EXIT
 envs="export TERM=$TERM "
 if [[ "$opt" =~ "-E" ]]; then
   FZF_DEFAULT_OPTS="--margin 0,1 $FZF_DEFAULT_OPTS"
-  tmux_verson=$(tmux -V)
-  if [[ ! $tmux_verson =~ 3\.2 ]]; then
+  tmux_version=$(tmux -V)
+  if [[ ! $tmux_version =~ 3\.2 ]]; then
     FZF_DEFAULT_OPTS="--border $FZF_DEFAULT_OPTS"
     opt="-B $opt"
   fi

src/terminal.go

@@ -30,7 +30,7 @@ strings. Acts as input validation for parsePlaceholder function.
 Describes the syntax, but it is fairly lenient.
 
 The following pseudo regex has been reverse engineered from the
-implementation. It is overly strict, but better describes whats possible.
+implementation. It is overly strict, but better describes what's possible.
 As such it is not useful for validation, but rather to generate test
 cases for example.