Transistors - The change in the base current
Collector current, which flows from \$V_{\text{CC}}\$ to ground (i.e. the emitter), is proportional to base current so increasing the base current also increases the collector current. The voltage across \$R_C\$ is \$I_CR_C\$, and it is also the output voltage in the first figure. So in this case the output voltage increases.

The second figure simply defines \$V_{\text{out}}\$ differently. It is \$V_{\text{out}} = V_{\text{CC}} - I_CR_C\$, so since \$I_CR_C\$ increases with increasing base current we can say that \$V_{\text{out}}\$ decreases in that case.

The second figure is the more typical definition of \$V_{\text{out}}\$, since typically voltages are referenced to ground. But the two circuits are basically equivalent (they are both common emitters) -- it's just a difference in the definition of the output voltage.